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I have an MSI MS-6777 motherboard with an AMD Athlon XP 2600+ CPU. When you hit the power button with the cpu power connector from the psu plugged in the fan will slightly twitch and the psu lamp in the rear will turn off like its unplugged from the wall. if you disconnect the cpu power connector the cpu fan runs full bore but nothing happens. you can hear the HDD power up and the disk drives get power but it wont post or give anything on the screen. i connected a fan to the mobo chassis fan header and it doesnt spin at all. i switched to the psu from my gaming rig (Corsair CS650M) and got the same result. I had an old AMD Duron 700 Mhz laying around so i threw it into the board. same result. i checked the CMOS jumper to make sure that it wasnt set to reset the bios and it wasnt. i pulled the jumper out actually. i tried going to just one RAM stick and got nothing. switched to other ram stick and still nothing. tried having no ram in it and nothing. Board wont even beep at me. also tried using intergrated graphics and removed the AGP video card. nothing different. Think its safe to say the board is dead?

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https://linustechtips.com/topic/697217-possible-dead-motherboard/
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From my experience it's rarely the board..... I had a psu that ran so badly that if it was powering even a hard drive in the case and another one powering everething else...... wouldn't detect graphics card. in the end I got a new boaRd and had the same issue until i got a new psu. so sounds like a dead board but who knows ...could be anything. frig I had a psu once that made a good graphics card make green lines and a dead one suddenly work flawlessly. boards are so sensitive these days... check everything, take ur board out, sit it on a table and bench test it with a different psu and if it powers up than keep going from theRe. 

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