When you press the power button you can hear the fan come on for a couple seconds, but the screen stays black the entire time. Then after about 10 seconds the power light goes off and comes back on. So basically it keeps rebooting itself, but at the same time I get nothing on the screen (not even the bios prompt)
I have tried reseating the LCD cable that plugs into the motherboard, removing power cord, and battery and putting them back in, reseating the RAM, reseating the HDD. Any ideas?
Shine a flashlight on the dark screen to see if you barely
see the icons on the desktop. If so, then the LCD Inverter is bad.
Plug in an external monitor and see if the display shows up on it. It can be
any kind of monitor even the old big fat crt monitors as long as it has a vga
cable to connect to your computer's vga port. If so that proves your
video card is ok. The video will show on most systems when you reboot
without you having to do anything. Some systems will require you to hit the FN
(Function key) + F1 thru F12. Hold down the FN key then hit the correct
key for displaying on the monitor (F1 thru F12). The correct key will
normally have CRT/LCD on it or it will have the icon of a display.
If you see no icons by shinning a flash light and the external monitor works,
then your screen is bad. If you see no icons by shinning the flash light
and nothing shows on the external monitor, then most likely your video card is
bad.
If it does not seem like it booted up all the way try the steps below:
When you plug in the power cord is there any lights
whatsoever on the laptop, where the plug goes in or on the AC Adapter of the
power cord?
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
laptop 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. And if that's true maybe you was
operating off the battery the last time you had it on and since the power cord
is bad, it was not charging the battery so the battery is drained and the power
cord is bad.
Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove the
Battery, then Press and Hold the power button for 30
seconds. After 30 seconds plug the power cord back in (leave the battery
out) and hit the power button to see if it boots. If it does, you can put
the battery back in and let it charge.
Maybe your DC Power Jack which is where the power cord plugs
into the computer is bad. Take an ink pen and push the tip inside the
jack and see if the little pin wiggles, if so the jack is bad. You'll have to
take the laptop apart to fix it. Most times it is soldered onto the
motherboard, so you will have to desolder the old and solder a new one.
Maybe your memory is bad or the memory slot is bad.
Remove the Power Cord, Remove the Battery, Remove the cover that houses the memory on the bottom of the laptop then 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.
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How do I check the inverter?
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