New DC jack, powers up but no display. Strange power LED behavior.

SOURCE: HP Media center 1170m

Hello Moneymakey, have you sorted out your machine's problem?

I had the same problem on my HP t350.uk machine but with different symptom.

It first appeared one year ago when my daughter switched off the machine (everything was fine up to this point) at night. The next day, the machine could not be started but she noticed the machine's power supply light was flashing. It was in this state for a few hours as she does not know what to do. Then suddenly the flashing stopped and machine can be started and everything returned to normal.

Then about half a year ago, I turned off the machine to add some memory (from 512mb to 1.5gb) and could not start the machine while the power supply light was flashing. My daughter told me the trick but it did not work after a few hours. So I left the machine connected to power over night. Next morning, the flashing was gone and everything returned to normal.

But later on, the machine occasionally ran into a freezing state, not responding to any input.  So a few days ago, I turned off the machine, and did some connection checking on the motherboard. But this time, the flashing never stops flashing, even after I have unplugged almost everything.

The flashing stops only after I unplug the power to the motherboard. By manipulating this power cable to the motherboard, I can manage to turn the flashing to the constant flashing, but the machine still can’t be turned on.

I was just wondering this event sequence would inspire any useful trouble shooting thoughts

Dr Q Mei

[email protected]

SOURCE: compaq presario sr1115cl wont power up

Remove the power supply after everything is unplugged and take it to your nearest electronics store. They should have a tester there. This is probably the problem.

SOURCE: No power to a SR1420NX.

Power supply light on or flashes Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure: CAUTION: This product contains components that are easily damaged by ElectroStatic Discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap that is connected to a grounded surface, like the metal frame of a PC.

1. Disconnect everything from the computer, including the power cord.
2. With the power cord disconnected , press the power button on the front of the computer for five seconds. Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps. NOTE: If the power supply fan makes an inconsistent grinding sound or stops and starts erratically, replace the power supply
3. With the power cord removed, flip the red voltage selector switch to the opposite position. Wait about five seconds, and then switch the red voltage selector switch back to its original location. Ensure that the voltage selector switch is on the correct setting, 115V for North America. Performing this step ensures that the voltage switch is engaged and set correctly for your country/region. Figure 4: Voltage selector switch Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
4. Plug a lamp into the same outlet to see if the wall outlet has power. Try the computer in a different outlet in order to eliminate the outlet as a possible source of the issue. Test both to see if the wall outlets have power.
5. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet. Test for power. If this fixes the issue, find the device that is causing the issue and do not use it. NOTE: If you find the device that was causing the problem was a surge protector, resetting a breaker or fuse on the surge protector may fix the issue.
6. Remove all attached devices except for keyboard, mouse, and monitor.
7. Remove any internal component that was recently added, such as video card, memory, CD, DVD, and hard drives. An added device may take more power than the power supply is rated for. If the problem goes away when the component is removed, the only option is to upgrade the power supply to power supply with a higher wattage rating.
8. Check the power switch:
   1. With the power cord disconnected, press the power button on the front of the PC. The button should release easily and not stick in the socket.
      • If the button sticks, it should be replaced or serviced.
      • If the power button does not stick and appears to be functioning, continue using these steps.
   2. With the power cord disconnected, remove the case or side panel.
   3. Follow the wires from the power button on the front of the computer to their connection on the motherboard.
   4. Look at the power switch cables connected to the motherboard. If the cable has become disconnected, connect the power switch cable connector to the connector on the motherboard. Figure 5: Power switch connector on Motherboard
   5. Replace the side panel, plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.

Nouveau IT, LLC

• 596 Answers
• Posted on Feb 02, 2009

SOURCE: BLINKING POWER LIGHT

When you restart your notebook do you have a blinking cursor when the system freezes? It sounds like you need to reset your BIOS. To do this, power off then on your unit, Press F10 to enter BIOS settings, and then F9 to reset the BIOS to default settings. (Your functions may be a little different but you can read your menu to see which function key to select.) Once this done, select "Save and Exit BIOS" This should get you going. As for the blinking light, sometimes this happens when the battery is not holding a charge. If your battery is new, try the BIOS reset first and comment on your results. I can guide you through the battery reset process, if needed. Good Luck.

SOURCE: Hp desktop wont start

I think you have more than one problem there. Take it to a local PC repair shop and have them check it out. Five years is a good age for a computer though so you may want to think about buying a new one. Best of the Irish Luck to yer.