Recently my pc's case rear fan is really loud when power on (it will reduce speed after 2 minutes), then 3 days ago I found the pc shut down by itself, though the power led was blinking green. I tried to press the power button to power up the pc but no response, it still was blinking green. I disconnected lots of cables include power cable, power switch connector then found the system will power on if I touch the power pin on motherboard with a screw driver. So I connected everything and it was working fine. I suspected it was caused by the case fan vibration so I disconnected it, thought it will be ok since I checked my cpu temp it was never too high.
Today I have the shut down twice again. The power led will blink (it will continue blink even if I disconnected the power cable for the PSU), pressing power button have no effect. It need some time to "cool down" before I can power up the system again. I read somewhere a hair dryer could speed up the process of discharge the residue energy but I haven't try this method yet.
I search around and think there could be several possible causes:
1. Power supply shut down for protection. I'm using a 400W PSU for AMD athlon II x4 640, 3 HDD. I checked PSU calculator again and found my configuration should only require 300W. I did use one cable from PSU to power the 3 HDD, so I split it into separate cables now.
2. Motherboard shut down for cpu overheating. Core temp said cpu 0 temp is 43 C, while HW info said the 4 cores have temp of 29C, TMPIN0 and TMPIN2 have 38 C 32C, and the HDD have 43C. I didn't do anything heavy in load when the 2 shutdown occurred today.
I ordered new case fan for rear and front (which is optional and not installed before in the case), will see what happens with the new fans.
3. I did reinstalled the cpu heatsink and fan after the first shutdown, and some thermal paste was lost in the procedure. I'm going to buy some more and apply it tomorrow.
What do you think? I'm going to try every method I found, but I'm not sure what's the real cause, and this random shutdown make me nervous for normal usage...
[update] it shut down again. And I can not power up the system now. If I wait some time and disconnect the power cable, the first attempt of powering on will make the fans rotate a little bit then stop, and the following attempts will have no response. I waited a longer time just found the first run will bring the fan to rotate a little bit more.
Is this the problem of psi?
Today I have the shut down twice again. The power led will blink (it will continue blink even if I disconnected the power cable for the PSU), pressing power button have no effect. It need some time to "cool down" before I can power up the system again. I read somewhere a hair dryer could speed up the process of discharge the residue energy but I haven't try this method yet.
I search around and think there could be several possible causes:
1. Power supply shut down for protection. I'm using a 400W PSU for AMD athlon II x4 640, 3 HDD. I checked PSU calculator again and found my configuration should only require 300W. I did use one cable from PSU to power the 3 HDD, so I split it into separate cables now.
2. Motherboard shut down for cpu overheating. Core temp said cpu 0 temp is 43 C, while HW info said the 4 cores have temp of 29C, TMPIN0 and TMPIN2 have 38 C 32C, and the HDD have 43C. I didn't do anything heavy in load when the 2 shutdown occurred today.
I ordered new case fan for rear and front (which is optional and not installed before in the case), will see what happens with the new fans.
3. I did reinstalled the cpu heatsink and fan after the first shutdown, and some thermal paste was lost in the procedure. I'm going to buy some more and apply it tomorrow.
What do you think? I'm going to try every method I found, but I'm not sure what's the real cause, and this random shutdown make me nervous for normal usage...
[update] it shut down again. And I can not power up the system now. If I wait some time and disconnect the power cable, the first attempt of powering on will make the fans rotate a little bit then stop, and the following attempts will have no response. I waited a longer time just found the first run will bring the fan to rotate a little bit more.
Is this the problem of psi?
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