hp laptop g62-355dx not booting

Greetings
i got my hp laptop g62-355dx.
it doesn't boot, i changed the memory and still same thing.
when i tried to reboot it.
i hear the fan, i hear the hard drive , but no Video output.
the little light on the CAPS lock blinks almost twice per second.
and stays like that till i force shut it down.
i opened , secured the connection to the monitor cleaned the ram and everything inside with comprised air and same problem.
twice of the 100 times that i tried to turn it on. actually it did turn on. and turn off again after the windows logo.

does that indicate a new motherboard properly ?
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Da_Ch0senAsked:
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nobusConnect With a Mentor Commented:
agreed -it looks more like a dead board
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Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
It may be configured in dual monitor mode with monitor 2 set as the primary... Try connecting an external display. If it appears normal on the external monitor... right click the desktop and select "resolution". If two monitors are shown, use the detect and identify button; then click the Display drop-down to select the appropriate display.
See attached image.
display.pdf
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Da_Ch0senAuthor Commented:
That didn't solve it , and i was expecting so, as i am not even seeing the BIOS.
the computer is not booting, but what confused me, how come it bootes some times (very seldom though)
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nobusCommented:
>>  twice of the 100 times that i tried to turn it on. actually it did turn on. and turn off again after the windows logo.   <<  this maybe due to overheating.
when you cleaned it, did you remove the fan, and renew the heatpaste on the cpu ?  that may help
  depending on # of times it blinls, it can indicate a bad cpu - or motherboard :
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01732674&cc=us&dlc=en&lc=en&jumpid=reg_r1002_usen
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Da_Ch0senAuthor Commented:
It's not a heating problem. Either CPU or motherboard.
Don't know which one to purchase for replacement.
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Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
Have you performed HP's Hard Reset process?

Disconnect all peripheral devices and remove all USB devices and SD media cards.
Disconnect the AC power adapter, remove the battery, and then press and hold the power button for at least 15 seconds to drain all residual power and restore default startup settings.
Reconnect the AC power adapter (but do not insert the battery), press the Power button, look for glowing lights near the caps lock and num lock keys, and listen for sounds of a fan or other moving parts turning.

For reference and what to do next...
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01443371&tmp_task=solveCategory&cc=us&dlc=en&lang=en&lc=en&product=4308434#N436
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nobusCommented:
>>  It's not a heating problem.  <<  how do you know?
you can feel the cpu, or fan in order to see if it is hot already; but that's about all you can do.
for testing the cpu - you need a mobo that runs it, and vice versa; but the cpu's rarely die - mostly the motherboard (so i would suggest buying that)
did you tes twit disk and cd removed, and only 1 ram stick?
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Da_Ch0senConnect With a Mentor Author Commented:
yes i did test that, and it can not be heat problem , cause after resting in an air-conditioned room for DAYS, it didn't turn on at all, i changed the ram (to a new one) with the CD removed.
most probably it's the board i guess
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Da_Ch0senAuthor Commented:
it was what i expected first of all
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nobusCommented:
not sure why you qualified the answer as C ??
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