Some information would be quite nice.
type of PC or laptop?
message on screen?
lights flashing or noises?
Its a home built PC. It does even pass POST and doesn't even get to point of putting the BIOS splash screen on the monitor so i didn't see the point in posting OS info etc.
It comes on, fans on the CPU and case speed up for 2-3 seconds then goes off then starts the cycle again.
No motherboard beeps either.
Motherboard - check for signs of bulging Capactiors
PSU - will power light stuff like fans / LEDS - try a substitute
or try with all DVDs drives and HDDs disconnected see if it will boot to an error message then add the drives one at a time an see if it boots.
memory - try booting with just one stick of memory try try swapping and see if it will boot.
I've tried disconnecting all the hard drives and DVD drives - No difference.
Tried booting from onboard graphics and ive swapped memory over and used only one stick - No difference.
No electrical smell from motherboard or bulging capacitors anywhere on the old or new motherboard.
I think its the CPU as its the only thing i haven't swapped.
Yes could be CPU or motherboard
try swapping CMOS battery and reset the BIOS to defaults
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