Laptop Boots to Dark Screen - HELP!

[koolx]

HDD wouldn't cause that IMO.
It's most likely either RAM or mobo - and since the mobo has already gone out once, and you replaced the mobo with one off of eBay...I'd probably point to that.

Does it attempt to stay on longer if you remove the battery/run only off of AC?
Have you tried only 1 stick of RAM at a time?
Any lights blink in a specific pattern to indicate a POST issue?

Hi carnage. I tried removing the battery and extra ram stick. But no go. But I did loosen up the screws of the fan that holds it against the mobo. It did boot to the desktop but only rarely.

At this point I'm inclined to agree with you that its a mobo problem.

I checked out a working laptop on eBay I'm thinking of buying to replace this broken one. Its got an ATA hard drive interface. I need to know if my IDE hard drive is compatible with it. Do let me know. I'd appreciate it.