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Laptop no boot!

Computer was dropped.  Lcd screen was damaged.  System would boot up.  I replaced screen and now system won't boot.  Hard drive flashes for one sec and then nothing.  I put old damaged screen back in and same thing.

Maybe motherboard was damaged during drop as well?  Now not working?
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Member_2_6492660_1
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Did you try a external monitor?

Did you reseat the hard drive and memory ?
Take the screen and inverter (if there is one) out and leave them out. Connect a monitor to the external VGA port and see if the laptop boots up. If it does, there's most likely a problem with one of the screen connectors; the actual pins in them are tiny and numerous and easily damaged, and if there's a short then the system may well not boot.
was the laptop on when it was dropped if so hdd could have had a head crash which is very bad

when it does come on for a second and go off it could be damaged

it could also be the power port was damaged and there is no power in the battery
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i would review the work you did; if it booted before, it still should do so
likely you have a bad connection, so inspect all connectors, and remove / reseat them
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I have reset memory, reset hard drive, hard drive light blinks for a minute then quits.

I have tried another hard drive and still the same.  This leaves me to think it is the motherboard.
remove and reseat the cpu also then, since it's not working, you risk nothing
WrightNetDesigns

When it dropped and you picked it up did you hear anything inside moving around?

Shake it a liitle see if you can hear anything

Depends on how hard it fell but someting could have broke on the motherboard

Sorry but only thing it is good for now is a door stop
maybe you find here some more steps to try :
- remove all external devices
- if no display - test with an external monitor
- test if it runs from battery alone, or from AC alone
- test also with a known good battery !
***some laptops have a reset button - if you have one use it!
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
-if you can access the bios battery, remove the battery, AC, and bios battery for a minute to reset the bios
or test it, it should read 3 V
*** you can test the disk on another pc, if you like !

===>>you can test if the mobo works outside the casing, connected to power and external video  !

you can also remove and reseat the video plug - it sometimes comes loose
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WrightNetDesigns
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You should assign points for the help we gave.

My comments told you it was a bad motherboard that deserves points
All the above where good answers but the problem was the motherboard