HELP - New PC build not booting!!

[divine]

Originally Posted by MarcLister

Mine did. There were 8 pins in all but a black cap over the left four so I didn't really notice it. Not until I checked the motherboard manual and realised the damned PC wouldn't boot unless all eight pins had some juice running through them.

I'm baffled as to the point of this cap really, unless older PSUs with just the 4 pin connector have a different output the 4+4/8pin ones which enables it to work. Otherwise, why cover half of it up, when it all needs to be connected?