HP Compaq Presario CQ50 black screen

Hello Experts,
I need your help because I'm in big trouble. I was asked by one friend of mine to reinstalled Windows and to clean up heatsink fan as his laptop is going off in 2-3 mins because of overheating. I upgraded current Windows Vista to Win 7 Pro, dessambled the laptop, cleaned up heatsink fan, put thermal compound between cpu, nVidia chip and heatsink, plugged all disconnected cables back into the motherboard (I checked out everything twice), then turned the laptop on and as outcome nothing is coming up on the screen (black screen and no windows logo). the power light is on, hdd light is on, wireless light is on, all the lights are on but the screen is still black. I'm sure as I checked all cables twice and evrything is connected properly. Something wrong with the screen or screen's inverter.
What am I missing?
Where else to look into?
This happened to me so the fault is mine and I have to sort it out.
Laptop model is HP Compaq Presario CQ50 with Win 7 Pro.

Please any advice will be appreciated!

Thank you in advanced!
nasolsiAsked:
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ded9Commented:
Do you hear POST beep and can you get in the bios???



Ded9
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nasolsiAuthor Commented:
Hi,
sorry I missed to mention it but no POST beep and I cannot get into BIOS either.
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ded9Commented:
POST beep is imp ...this mean the hardware is not working or not connected properly...reseat ram , video card, etc ..make sure they are properly connected.

Also remove the bios battery ...wait for 15 minuts and then connect it.



Ded9
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nasolsiAuthor Commented:
Hi again ded9,
I've done everything as reseated ram at least twice, removed BIOS battery at least twice for more than 15 mins and still nothing. I've only removed old compound from NVidia chip and put new one. The same I done for CPU. I'm sure that everything is connected properly as I dissambled it twice to check out the connections.
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nasolsiAuthor Commented:
Hi ded9,
I fixed it already. It was my fault. I reseated ram and now it is working like brand new.
You deserve all the points.
Thank you once again!
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nasolsiAuthor Commented:
Reseating ram made it working again.
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