PC not turning on (mobo light on, no fan)

June 16, 2009 at 15:11:13
Specs: Windows XP
Hello!

windows xp
psu: 500W total.. -12V 1A 12W
gpu: 8800gts evga
cpu: amd dualcore.. 2.5
mobo: asus m2n sli deluxe

[i built this pc myself 2 years ago]
I moved my pc from one house to another and was cleaning dust off the fans. I cleaned the PSU, heatsink, and video card fans. I took off the heatsink and vid card to wipe off the dust, the psu stayed in place. I turned on my computer and it was working for 5-10 minutes until it suddenly turned off. It wouldnt turn back on, i checked all the plugs inside, and when i'd try to turn it on the fan in the pc case would move a tiny bit and make a noise, but that's all that happened (the fan that is installed into the pc case). Then all of a sudden the pc turned on again but shut itself off after about a minute.

I figured the power button on the case malfunctioned and bought a new case(laugh), and plugged in the PSU, MOBO, PROCESSOR.. and all the fans turned on, pc fan, heat sink and psu fan.. lights and everything, then i turned the pc off (by the 1/0 on psu.. not thru power)... attached the gpu, hdd, and the pc wouldnt turn on again!! the pc fan did the same little noise.

any ideas?! so the psu has to work since the mobo light is on? the processor and heatsink work b/c they turned on after computer malfunction. Shouldn't the pc fan turn on when i push the power button? It's connected directly from the psu.. so from power button -> mobo -> psu -> fan. I'm not sure in what sequence a computer turns all its hardware on but im guessing th emobo tells the psu to turn on and power the rest of the system.

Thanks for reading!! and any ideas are appreciated.


See More: PC not turning on (mobo light on, no fan)

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#1
June 16, 2009 at 15:34:28
The thing I would try is cleaning and reseating the cpu. Remove the cpu cooler and clean off the thermo paste then apply new paste (1 small drop). Reseat the cooler. If the cpu lose's contact with the cooler it can cause it to not post. I had an old amd that had the same issue. I'm assuming you checked all the wires and connectors also?

WinXp Amd 64 3000 Msi Neo2 Platinuim 1 gig ddr 400. When we cast a pebble into a pond we should look past the first ripple.


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#2
June 16, 2009 at 15:45:03
Guess I should read post twice before responding lol. Sorry. Actually most mobo lights indicate voltage not amperage. If you have 1 try swapping out the psu.

WinXp Amd 64 3000 Msi Neo2 Platinuim 1 gig ddr 400. When we cast a pebble into a pond we should look past the first ripple.


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#3
June 16, 2009 at 16:09:35
i actually replaced the silver paste already (had an old tube).. and i dont have an old psu, but i'll try to find a psu for now. Thanks!

ps: so the mobo light doesnt indicate a fully functional psu?


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Related Solutions

#4
June 16, 2009 at 17:08:58
update:

jumped the psu, green+black wire, and it works fine.. grr

jumped the mobo @ power+ground, nothing (Same clicking noise around cpu/fan)

did i break the mobo :(


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#5
June 16, 2009 at 17:53:10
EVERYTHING WORKS OUTSIDE OF THE PC BOX.. will try to put it inside :X

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#6
June 16, 2009 at 18:23:20
Thinking maybe the switching circuit might be bad on board. As to the lite no it just means your getting power to the mb. Psu can have a bad rail and the light can still be on. The power sequence is usually psu to mb mb to switch.

WinXp Amd 64 3000 Msi Neo2 Platinuim 1 gig ddr 400. When we cast a pebble into a pond we should look past the first ripple.


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#7
June 16, 2009 at 18:26:58
The case fan. Is it the same one from the old case? If so leave it unplugged.

WinXp Amd 64 3000 Msi Neo2 Platinuim 1 gig ddr 400. When we cast a pebble into a pond we should look past the first ripple.


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#8
June 16, 2009 at 20:20:57
thanks for the help guys.. apparently it was nothing after all (so far).

i put everything back together and in the case.. no idea what happened.. but learned a few tricks along the way.


cheers


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#9
June 16, 2009 at 21:30:32
Might have been a bad ground on 1 of your standoffs. G/l

WinXp Amd 64 3000 Msi Neo2 Platinuim 1 gig ddr 400. When we cast a pebble into a pond we should look past the first ripple.


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