tried fixing it, made it worse...

August 13, 2009 at 01:01:02
Specs: Windows xp home
ok, i hope this is enough info here. if not, let me know anything else you need.

the other day i started up my Emachines t3990 and it would make it to the logo screen, then restart itself and repeat. tried turning it on/off but it made no difference.

decided to clean the inside of the tower because it had been a few years and badly needed it anyway. took the power supply unit and all fans out for better access while cleaning it. put everything back together, tried starting and now it says "system fan is not operating correctly. check system fan operation" and won't go past that screen. checked all wires, connectors, and pins in the connectors and it all looks good. all 3 fans are working too! not sure what happened here, but i will try any advice anyone can give. can anyone specify which fan is my "system fan"? that might help me narrow it down. thank you

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August 13, 2009 at 12:23:26
Look for a fan connector on the motherboard that doesn't have a fan connected to it. That might be it.
Otherwise, try swapping the fans around. It might be that the fan you plugged into the system fan connector does not have a fan speed detector. It should have three wires going to the fan.

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August 13, 2009 at 12:32:40
The header for the heat sink/fan is usually marked on the board as CPU fan. The others are not important where they go.

Hope you didn't use a vacuum cleaner on the computer. There are two or more power connectors that go directly on to the motherboard. The first is the 20/24 pin main power connector. There is usually another power connector than could be a square 4 pin or even an 8 pin. They are not the same type of end as the connectors that go to your drives.

If you removed the cards and RAM be sure they are fully seated.

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