Computer turns on but won't boot at all. Diagnostic lights are A: blinking amber, B: amber, C: green, D: green. Sometimes it beeps. Replaced with new ram pc2700 ddr 512mb 333mhz. Also, CD Rom lights have blinking green lights and when button is pushed, does not open.

Is the computer plugged in to a known good power source with a known good power cord? Also, make sure the power is fully seated on both ends. When you press the power button are you getting any indicator lights? The power button itself has an LED that will be either solid green, blinking green, solid amber, blinking amber, or off. Do you hear any beeps?

Maybe a bad PSU? You said you looked at every site, but look at these: http://support.dell.com/support/edocs/systems/dimE521/en/SM_EN/adtshoot.htm#wp1054146 OR : http://en.community.dell.com/support-forums/desktop/f/3514/t/19341603.aspx

The Dell Dimension 300 gets the amber blinking light when there is power to the computer (the power supply) but the motherboard isn't getting the correct power. Sometimes it can indicate a motherboard fault or that the power supply is not set to the correct incoming voltage.

Check the back of the computer. If the power supply has a switch for incoming voltage, make sure that it matches your incoming voltage. Next check that the main power cable (20 or 24 pins depending on the computer) is fully seated on the motherboard. (It can only be connected one way and should lock onto the connector on the motherboard.)

Next check that the power supply is providing the correct power. You can simply install another power supply (known to work on another computer). Make sure that the PSU is correctly sized for the computer components. Alternatively use a multimeter or a dedicated power supply tester or put it in a different machine.

If the problem is not cured with a new PSU, the motherboard has a failure. Unfortunately, it's difficult to identify the exact bad component. (If a major component other than the CPU on the motherboard had failed, the diagnostic lights or beep codes could help identify the issue.)

I hope this helps.

Cindy Wells

I think your problem is your memory or video card.

Below are some steps that I recommend.

When you plug in the power cord is there any lights whatsoever on the computer?

When you press the power button do you hear fans running, hard drive spinning, lights on the computer, hear any beeps or lights constantly blinking, hear the DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a second or two? If so the laptop is trying to boot or may have booted, but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with the computer and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe your power cord is bad if you don't get anything to happen whatsoever when you press the power button.

Maybe you have a Static Charge Buildup. Remove the Power Cord, then Press and Hold the power button for 30 seconds. After 30 seconds plug the power cord back in and hit the power button to see if it boots.

Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

Maybe your power supply is bad. Sometimes there is enough power to make the power light or some other lights come on but not enough power to make the fan turn on or hard drive spin.

Below are links and info I found from Dell's Website based on your model.


http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/specs.htm

Controls and Lights Front of computer:

Power button - push button

Power light
green light - Blinking green in sleep state; solid green for power-on state.
amber light - Blinking amber indicates a problem with the power supply inside the computer. If the system cannot boot and there is a solid amber light, this indicates a problem with the system board (see "Power Problems" in your Owner's Manual).

Diagnostic lights
four lights on the front panel (see Diagnostic Lights.)

Standby power light
AUX_PWR_LED on the system board

Hard-drive activity light
green light - When the computer is reading data from or writing data to the hard drive.

LAN indicator light

green light - Solid green indicates that a LAN (local area network) connection is established.

http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/adtshoot.htm#wp1056411

Remove the Power Cord, Remove the Battery, Remove the cover that houses the memory then remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.

Most newer models of Dell computers now have a diagnostic LED surrounding the power button on the from of the computer. When you press the power button to boot the PC, the light should be green and remain green under normal circumstances. Any other lights will help you troubleshoot the power issue you are having.

A solid green light means the computer is operating normally.

A solid yellow light indicates the power supply is operating normally but the computer is not processing data. This could mean there is a problem with the CPu or another component on the motherboard.

A blinking yellow light indicates the power supply is receiving power from the wall, but not functioning properly. This generally means the power supply itself is bad and should be tested or replaced.

A blinking green light means the computer is in standby mode.
So use the LED power light codes if your Dell computer has them. Also pay attention to any unusual beeps or sounds coming from the computer. Then join us in our free computer tech support forums and we'll try and help you solve your PC problem. Sometimes, however, a service call to Dell will be required. If your system is still under warranty, you should always just call them first, as tampering with your computer may void your warranty.

Hope this helps!

Contact technical assistance.They will most likely ask you to send it back to repair.

This chart is where I got my conclusion.

Power Light

Problem Description

Suggested Resolution
Solid green
Power is on, and the computer is operating normally. On the desktop computer, a solid green light indicates a network connection.
No corrective action is required.
Blinking green
The computer is in the suspended state (Microsoft® Windows® 2000 and Windows XP).
Press the power button, move the mouse, or press a key on the keyboard to wake the computer.
Blinks green several times and then turns off
A configuration error exists.
Check the diagnostic lights to see if the specific problem is identified.
Solid yellow
The Dell Diagnostics is running a test, or a device on the system board may be faulty or incorrectly installed.
If the Dell Diagnostics is running, allow the testing to complete.
Check the diagnostic lights to see if the specific problem is identified.
If the computer does not boot, contact Dell for technical assistance.
Blinking yellow
A power supply or system board failure has occurred.
Check the diagnostic lights to see if the specific problem is identified.
Solid green and a beep code during POST
A problem was detected while the BIOS was executing.
See "Beep Codes" for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified.
Solid green power light and no beep code and no video during POST
The monitor or the graphics card may be faulty or incorrectly installed.
Check the diagnostic lights to see if the specific problem is identified. See "Video and Monitor Problems" in your Owner's Manual.
Solid green power light and no beep code but the computer locks up during POST
An integrated system board device may be faulty.
Check the diagnostic lights to see if the specific problem is identified. If the problem is not identified, contact Dell for technical assistance.

Most newer models of Dell computers now have a diagnostic LED surrounding the power button on the from of the computer. When you press the power button to boot the PC, the light should be green and remain green under normal circumstances. Any other lights will help you troubleshoot the power issue you are having.
A solid green light means the computer is operating normally.
A solid yellow light indicates the power supply is operating normally but the computer is not processing data. This could mean there is a problem with the CPu or another component on the motherboard.
A blinking yellow light indicates the power supply is receiving power from the wall, but not functioning properly. This generally means the power supply itself is bad and should be tested or replaced.
A blinking green light means the computer is in standby mode.


So use the LED power light codes if your Dell computer has them. Also pay attention to any unusual beeps or sounds coming from the computer. Well, I was sure that the voltage selection switch was in the right place. And I found it highly unlikely that the processor power cable would suddenly unseat itself. Ugh.
Then I had an idea. I flipped off the surge protector and then flipped it back on. Tada! No more orange lights. Weird. The moral of the story: try the simple stuff first.

I hope this helps and please dont forget to rate my answer. Thank you! :D

Hi there.
Sounds like the battery could be faulty.
The diagnostic procedures from the Dell User Guide are as follows:

Total Power Failure When Using a Battery
If an AC adapter is not connected to your computer, the computer's power source
is a battery. If the battery indicator flashes amber or is a steady amber, the
battery needs to be charged. If the battery is flashing green and amber, the
battery may be defective. To troubleshoot this problem, use the following
procedure.
1. Turn off the computer and peripherals, and disconnect them from AC power.
2. Reseat each installed battery by removing it and then replacing it.
3. Turn on the computer. Does the green power indicator light up?
Allow one minute for the computer to initialize its components before checking
for signs of power.
Yes. Continue to step 4.
No. Use the AC adapter to connect your computer to AC power. If the computer
operates normally when using AC power, go to step 7. If the computer does not
boot when using the AC adapter, see the previous subsection, "Total Power
Failure When Using the AC Adapter."
4. Does the battery indicator flash amber or show a a steady amber light?
Yes. The battery needs to be charged. Go step 5.
No. Go to step 7.
5. Connect the computer to AC power, and fully charge the battery.
For instructions, see the topic titled "Charging the Battery" in the online
System User's Guide.
6. As the battery charges, does the green battery indicator light up?
Yes. Go to step 9.
No. Go to step 7.
7. Is the battery indicator flashing green and amber?
Yes. Your computer may be in a hot environment. Charging the battery in this
condition may affect the life span of the battery. Continue to step 8.
No. The problem is resolved.
8. Disconnect the computer from AC power. Is the the battery indicator still
flashing amber?
Yes. You may have a defective battery. Continue to step 9.
No. The problem is resolved.
9. Remove the battery, and press its test button. Is the uppermost indicator in
the charge gauge of the battery flashing?
Yes. You have a defective battery. Continue to step 9.
No. The problem is resolved.
10. If a spare battery is available, fully charge it, and then install it in the
computer.
11. Turn on the computer. Is the power indicator off?
Yes. Your original battery is defective.

Good luck

please refer to the below link...being dell support technician myself this link would give you the best possible help
http://support.dell.com/support/edocs/systems/dsleest/codemess.htm#diagnostic_codes