Please help 1st build fail

[BBSHOCKSZ]

Hey guys my friend has just built his 1st PC and it booted successfully but when he did a windows update and it prompted it re boot it did but now it won't switch on ? Any ideas as to what it is
Btw he is using windows 8 and Haswell CPU with gtx 760 and a gigabyte z87 chipset motherboard
And his i5 4670k is cooled by nzxt Krakan

 

[ganon11000]

could be a PSU failure, what PSU have you got?
Do any fans spin?

 

[BBSHOCKSZ]

could be a PSU failure, what PSU have you got?
Do any fans spin?

Sorry forgot to close thread don't worry no more he fixed it it was the CMOS battery but thanks for helping