I've just put together a new system for my housemate and we're having some problems. When the computer is switched on the monitor says that it's receiving no signal. We've tried changing the graphics card but that's not worked. If the 4 pin ATX power cable is plugged into the motherboard the CPU fan won't work, but if it's not the CPU fan works normally, which is something I've never seen before.
It may be your power connections. Double-check that your 24-pin & 4-pin are correctly connected. Some PSUs let you split the 24-pin into 20 & 4 pins and there's where problems may occur.
Check for extra standoffs.
If the pc powers on and off in a loop, try each stick of ram in each slot and up vdimm in bios once the pc posts.
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