The computer will boot sometimes when you apply pressure around the keyboard. A friend of mine is pretty good with computers and could do the repairs if we know where to look. I am a computer novice at best.
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Wait Black Screen? AFTER you changed the fan... hmmm... I think I know what the problem is. Okay solution one; You might of hit a wire or cord in the computer when you changed out the fan. Two: You might have the virus 223, get it fixed and it should be going again! Hoped this helped! :D
Are the activity lights blinking like the computer is doing something? If so the monitor may be disconnected from the unit or damaged. If so this is a pc repair issue, and a little tricky to do on your own.
Yap actually i greet you first
what your system is prompting you is that your Processor is getting Bad and you will need to replace it with a new ones ok
After that your system come back to life .
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IBM's are famous for this ...that's why they've changed their keyboard configurations so frequently, because palm pressure would either a) prematurely damage the hard drive or b) cause problems with the AC/DC card (IBM's term, not mine).
My guess, since I used to repair IBM laptops for a living, is the AC/DC card. It directly controls video output to the LCD. You can probably find one "pulled" on eBay for around $50, and probably $50-100 for someone to install it for you.
Chips DO get loose and what you're experiencing is a common problem with IBM T40's. The solder that holds the graphics processor to the motherboard is cracked and no longre consistantly makes a good connection. This problem can only permanently be resolved with a new motherboard, or reflowing the solder of the GPU chip on the old one with a heat gun. Do a search for "thinkpad solder reflow" in any search engine.