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PC crashed, motherboard still powered, nothing happens

by reyjd / June 24, 2004 6:20 AM PDT

My PC (ATX Athlon TB 1300) crashed (for overheat ?)
Then impossible to restart it.
Motherboard diode is green (therefore power works)
When pushing the button, nothing happen, NOTHING, no fan, no vid, no move in the floppies, and the green diode on the MB still on...
Then I removed all, HD, boards, RAM, CPU), still nothing....
What can I do ?

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Re: PC crashed, motherboard still powered, nothing happens
by jconner / June 24, 2004 6:32 AM PDT

If the CPU overheated due to CPU fan death or poor heatsink contact - replace it. AMD's die instantly in overheat situations. From Experience.

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Re: PC crashed, motherboard still powered, nothing happens
by reyjd / June 24, 2004 6:36 AM PDT

if CPU dead, PC doesn't start ?

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Re: PC crashed, motherboard still powered, nothing happens
by rhyvun / June 24, 2004 7:29 AM PDT

Correct. In fact, you might not even get post beeps. It kind of depends on the board usually though

If your CPU is dead you can probably tell, there will probably be a foul stench, or you can see the burn marks on it. Otherwise, I'd blame the power supply.

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The green lighted diode ONLY means that
by Ray Harinec / June 24, 2004 9:38 AM PDT

the 5 volt standby power is available from the Power Supply[Pin 9]. It says nothing about the 12 Volt rail and the Main 5 volt rail.

To test the supply without a voltmeter by seeing if the fan turns on in the supply, Remove the connector from the mobo and put a jumper from any of the black [ground / common] wires to Pin 14 [the PS ON pin]. Holding pin 14 at ground potential should cause all of the power supply rails to go ON. [and the fan should be a possible indicator]. Much better if one has a voltmeter.

In normal operation when you hit the Power switch the logic circuitry powered by the 5V SB [standby] pulls Pin 14 to ground [logic low].

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