Computer will only boot up after power connected for 5 minutes
PC, 4 years old, quad core Intel, ASUS P5QL mobo, HEC 550 W PSU, worked perfectly but now is completely dead until the power has been on for around five minutes. Then it boots normally and again works perfectly apart from not returning from sleep mode. Will a new PSU or mobo solve the problem?
More aboutcomputer boot power connected minutes
I would try the PSU first - it looks like a power problem.
try replacing the cmos battery first.on new mb if there low or dead some mb wont post till the cap/cmos has a charge.