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View Full Version : PC turning itself on and off



dgoddard
13-06-2009, 06:32 PM
Our HP pavilion 340 keeps turning itself on and off , ive tried removing the power cord and reinserting but it starts to boot up then stops and then tries again and keeps trying over and over but nothing gets to loading screen and shuts down.
Was ok this morning so not sure if its hardware or a software problem , im on the daughters lap top at the moment so i can send thread HELP PLEASE

Blam
13-06-2009, 06:38 PM
At what point does it reboot?

Can you tap F8 then select "Disable Automatic Restart" it may be a BSOD.

Have you tried safe mode and last known config?


Blam

dgoddard
13-06-2009, 06:43 PM
its reboots as the HP logo comes on screen so last for no more than a few seconds it only shows to buttons F1 and F10 if thats of any help?
Dont get time to pres the buttons it dies so quick then starts all over again.
not sure how to start in safe mode?

stormdragon
13-06-2009, 06:49 PM
Could be overheating, ensure that all fans are working and that the fans and ducts are clean of dust/dirt.

Blam
13-06-2009, 06:53 PM
See if you can hit F1 and access the BIOS.

Its most probably overheating, open the up the side of the case and make sure the heatsink has no dust clogging it and is on tightly.

Blam

dgoddard
13-06-2009, 06:54 PM
yer did check there was a bit of dust on ducts but now clean , fan starts up with PC then dies . Its cool now as ive had power cord out for 10minutes and still does the same powering on and off

stormdragon
13-06-2009, 06:56 PM
Don't forget to check the heatsinks as well.

Try disconnecting the power to the hard drive, cd drive, (floppy?) and see if it will stay alive.

dgoddard
13-06-2009, 07:00 PM
ok help what does a heatsink look like?

Blam
13-06-2009, 07:00 PM
In that case I would try another PSU. Sounds like its about to die.

Heatsink it a big thing sticking out the motherboard with a fan on it

Blam

stormdragon
13-06-2009, 07:01 PM
Heat Sink (http://images.google.co.nz/images?hl=en&q=computer%20heat%20sink&um=1&ie=UTF-8&sa=N&tab=wi)

dgoddard
13-06-2009, 07:06 PM
ok ta will take cover of and give it a clean thanks

stormdragon
13-06-2009, 07:07 PM
Heatsink it a big thing sticking out the motherboard with a fan on it

Not every heatsink has a fan on top of it most north and south bridges these days have heatsinks but not fans.

Blam
13-06-2009, 07:12 PM
Not every heatsink has a fan on top of it most north and south bridges these days have heatsinks but not fans.

I was refering to CPU hsf...

I've rarely seen north or southbridges with fans on them

stormdragon
13-06-2009, 07:18 PM
Figured what you were refering to, although a clogged up heatsink of any sort not just CPU will cause problems.

Some highend motherboards have fans attached to the bridge heatsink.

Blam
13-06-2009, 07:21 PM
Figured what you were refering to, although a clogged up heatsink of any sort not just CPU will cause problems.

Some highend motherboards have fans attached to the bridge heatsink.

Yea, but CPU HSF is most common.

gary67
13-06-2009, 07:45 PM
Also check the power supply fan for dust. Just DON"T open the casing of the power supply