I have a problem with the power ! sometimes I turn it on the fans click on then the computer beeps and shuts down it only stays on for about 2 sec and shuts down to the point that it won't turn on at all
would it be easier just to buy a new mobo because I think this one is trashed
Without having the specs on the motherboard or knowing how old it is, it's difficult to say if it is beyond repair. Although my experience with computers shutting down that quickly while attempting to boot have been a problem related to processor overheating. Processors get very hot within seconds of powering on. If the processor cooling fan or the thermal paste is not working as intended the system will shut down quickly. You may want to check those two possibilities before purchasing a new motherboard.
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As you may already know, your computer will shut down after power on if if the power supply does not receive a power good signal from the motherboard. Since you already tested the PSU in another computer, and you know the PSU is good, either you have a bad mobo or some device connected to the power supply is draining excessive power from the PSU and causing it to shut down.
Try removing the 4 pin pin power plugs from ALL devices, such as the floppy drive, CD drives etc.
If the system stays on when you power up, then you can isolate the faulty device by re-connecting them one-by-one. If the system still shuts down your Mobo or CPU is bad and you might want to take it to a PC technician to determine if it's worth fixing.
If you have any additional questions contact me by clicking on the "Add a comment" link located under your problem description on FixYa. Also, if you believe that this information was helpful to you, please return to the FixYa website and rate my response to your question.
HI, Clear CMOS or remove CMOS battery, Press the on off switch for 30 seconds. Now go to BIOS setup,and set bios fail save default,and press F10>enter.If the problem same change the RAM if you have a spare. http://www.computerhope.com/help/phoenix.htm
try replacing youre power supply, or if youany spare one use if the result is still the same then you have a motherboard problem, i also have the same problem with mobo, same thing, i already tried using a diff power but there still no boot or any beeping sound,
Does your system give off any kind of beep or beeps before its shuts down? from what it sounds like, you might have a short some where , a bad mobo or bad cpu. Try using another cpu on the mobo and see what it does.
Standby does not turn off the computer. It reduces power consumption but does not turn the CPU off or the power supply. Because the cpu is still on the cooling fan stays on to cool it. If you want it to turn the fan off or be silent I suggest using hibernate or shutting it down completely.