PC Wont Power On

Veanie

Veanie

Veanie

Associate
Joined
18 Mar 2004
Posts
40
Hi, I have an issue whereby my PC will (rarely) power on. The only way round the problem is to kill power to the PC completely, wait 5 minutes and then power on and turn on.

This works maybe 1 in 10 times.

Even when the PC will not start, the system board lights are on. To clarify 'will not start' it is completely dead (other than the lights), no fans, nothing.

Work I have already done.
1. Moved and tested RAM, all okay.
2. Replaced CPU heat sink and reseated CPU.
3. Removed system board, checked all connectors and rebuilt.

The relevant (to my mind) components that I am thinking could be the problem are the system board or power supply.

Asus Z87 MAXIMUS VI FORMULA
BeQuiet Dark Power Pro P10 850W '80Plus Platinium'

Which is the most likely culprit ?
 
So that is 1 vote for system board and 1 for PSU.

Whilst the system board lights up, it does so as you would expect prior to turning the PC on. There is no board confirmation stating no power and everything looks normal.
 
Do you have it plugged into a surge protector or extension?? If so try plugging directly to wall and power on.

Try changing the lead to the psu/ test with another psu if possible.
 
another vote for the PSU as above.. have you got another one you can try in it? or even borrow one from a mate to see if it works.
 
Sounds like the PSU triggering some sort of protection to prevent the PSU coming under load. Switching it off for a few minutes will dissipate the charge in the capacitors used to smooth out the power and used in the overprotection to reset it. Just a guess because you have a light on the board still.

Paperclip test on the PSU without having to switch it off for a few minutes would rule out the motherboard if it still doesn't turn on.
 
Veanie said:
So that is 1 vote for system board and 1 for PSU.
Click to expand...
None of that discusses how a computer works. A power controller accepts inputs (such as the front panel power button). Then responds accordingly by ordering a PSU on. A voltage monitor determines if the system is stable. Only then does the power controller let the CPU execute.

What happens in your system. A meter and minutes of labor using requested instructions means the next answer can say what is suspect and what is exonerated ... without all that speculation.

Otherwise just start selecting whatever part you suspect. From the information provided, you will be just as good as anyone else at selecting what to replace next. Shotgunning is replacing good parts until something works. Good diagnostic procedure sees a fault (ie with a meter) before changing or even disconnecting anything.
 
I'll do the honours..

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