PC starts, but no POST

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My PC behave crazy...
Sometimes it turns on and it's working fine...
But sometimes it doesn't...I mean...there is power...fans work...but no beep from speaker...and the screen is blank...

Any ideas ???

 

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Intermittent faults are always difficult.

When you get no boot or beep on switch on this *usualy* means that the processor isn't starting. The only way to check is by using a device known as a 'postcard'.

It sounds like you may have a thermal problem. But whether this is the CPU, the motherboard, or memory is impossible to tell.

Harry.

 

runiu,

Try safely and carefully removing the RAM and see if you get the beep codes for "missing RAM."

Please post back with your findings.

 

The thing is that it sometimes works...

I checked memory and it's ok...cpu is also ok...it's not overheating...

It just sometimes turns on and works fine and sometimes just turns on without any beep...crazy...

When I took off RAM also there wasn't beep...

 

i had a similar thing when building my system. it would power up ok but would not post, turned out to be the graphics card. the fact yours has no display,might be worth trying a spare graphics card if you have one.

 

Another possibility - depending on the age of the machine, is 'bad caps'. Look at the electrolytic caps on the motherboard. Are the tops flat, or are they bulging. See here for an article with some photos.

While this was a a few years ago I'm still seeing such motherboards being brought in because of problems.

Harry.

 

runiu,

Does your motherboard have an onboard or external speaker?

 

Check your PSU is connected to the mobo properly

 

is it an asrock k7 board?

 

Have you reset the BIOS with everything in? I've had these exact ssame symptoms several times because my system didn't like Starforce (a copy protection system that installs software on your system that you otherwise wouldn't).

Give that a go before pulling apart your system.

 

Had several doing this recently........

Check all electrolytic capcitors for a brown discharge as well as dooming or splitting of the tops.

Try using a torch to shine on them to see any damage!

 

I guess the best thing to do is never switch off the machine ;)

I managed to switch on correctly and I won't switch it off ;)