New PC not booting

[Ughmahedhurtz]

Make sure your fan is pluged into the fan1 or whatever slot. Fast turn offs like that mean that the computer thinks there is no fan on the cpu.

Also if you use a fan that has low rpms it might think the fan is not working right.

Fans are one of many culprits.

Better yet, just get a motherboard that has a diagnostics readout on it (like the Intel extreme or EVGA motherboards) and it will tell you exactly what it thinks is wrong.

[MiRai]

A little bird once told me that some motherboards can be picky about the voltage of the RAM modules. If, as a last resort, try
throwing some RAM in there that operates at 1.5v instead of what you've got.