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power on problem

 
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truckmiester



Joined: 03 Jan 2011
Posts: 1

PostPosted: Mon Jan 03, 2011 2:30 pm    Post subject: power on problem Reply with quote

pc died whilst using, thought prossesor had cooked, gave it time to cool down and switched back on. No power, checked surge protector, ok, checked plug fuse, ok, tested power supply in pc shop, ok.
Changed MB, had to change processor and ram too because my board were so old, put it all together and and switched on, got a twitch out of the power supply fan and nothing else, pressing power button again results in nothing, but if i switch off then on at power supply and try power button again i get a twitch out of the fan.
i know MB is getting power because stanby and core unlocker LEDs are on.
stripped and reassembled whole pc to double check connections and the only part i have not connected is case speaker due to being different connection to board.

sorry its long winded
any help would really be appreciated
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JonS



Joined: 31 May 2010
Posts: 813
Location: Morecambe

PostPosted: Mon Jan 03, 2011 4:06 pm    Post subject: Reply with quote

options:
1) you've blown the motherboard during assembly (or maybe bent a pin on motheboard / CPU)
2) the cpu is not seated correctly
3) the motherboard can't handle that cpu - check the compatibility charts
4) memory faulty or not seated correctly
5) PSU is not powerful enough for that CPU/board/graphics combination. Check the required power demands of what you've fitted and compare with the PSUs power output
6) the PSU IS dead - don't trust the shop
7) front panel leads, or USB connector leads are wired incorrectly
8) one of the front power buttons is jammed

A question for you. You say the PSU tested out OK. Did you actually try another PSU in the machine with the old board etc? My guess is that the initial diagnosis was wrong.
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