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IBM Thinkpad T40, Windows XP Prof Computer works fine for 20 - 30 minutes, then screen goes blank. Backlight still funtioning at this point, computer unresponsive to any keystrokes, ie. Alt+F4 for shutdown. Unit can only be turned off by pressing and holding the power on button. Fan runs normally, CPU replaced with known good CPU, CPU/fan cleaned w/ alcohol and new heat sink grease appilied. Screen becomes sporatically grainy and picture shifts with random black lines flashing 1 to 2 minutes before screen goes blank. Thanks, JB

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Try another vedio card (vga)

best regardes

don't forget to vote if you see that helpful

Posted on Mar 28, 2011

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