ale skor by som povedal, ze to bude nasledovny problem:

Here is a classic problem with Younger NF7 mobo's.

I've just newly purchased an NF7-S v2.0 now without any problem at default settings. I started over clocking and ran into a big problem the system now does not boot and I can't resurrect it. There is no video signal at boot time? Fans turn, Hdd spin up, red & green lights are on on the mobo....I tried clearing CMOS but it does not help? Any ideas what to do next?

Answer to this as described above is you have hosed your BIOS chip. Most over clockers will have encountered this in Ocing NF2 boards. It's a well-documented problem of the NF2 chipset saving new BIOS settings via the NB memory - which corrupts the data when FSB is "out of spec". It's generally a problem to younger boards but as they get "run in", they mature and the problem disappears. As I have said before, because of this flakiness its a good idea to have another bios rom and hot-flash the old one if this happens to you, if your into Ocing then a backup spare Bios rom or a Bios Saviour will not go amiss.