A friends PC has been behaving erratically, particuly at Start Up. On some occassions it starts normally, but most other times the system fans etc come on but there is no display and no HDD activity.
My inital thought was this was memory related and Memtest+ stalled the first couple of times I ran it. I have never had Memtest+ stall before so I removed one of the modules and hey presto Memtest+ ran correctly. However on testing the module I had previously removed it ran fine in the first memory slot but not the second. This led me to believe the motherboard may be suspect.
I have since tried another set of memory modules that I know work as a pair and individually in all possible combinations and at one time or another they have reproduced the same problem.
I have disconnected all unneccesary hardware, DVD drive, HDD in case they were causing a problem but the problems continued.
I have also tested it with a different PSU with the same results, starts correctly sometimes but most times it does not.
I am leaning very heavily towards the motherboard being the problem but is there anything else I can check.