the processor and the mobo are new, all other components from my old system.
i built the system today, and when i pressed the start button the cpu fan sort of kicked and span a little and then stopped, the graphics card fan and the psu are working but there is no display on the screen, there dont seem to be any error codes either
i have tried different ram configs etc, at a bit of a loss here
Try reseating all the components - i.e. the expansion cards, but particularly the memory. I had this problem recently on a new build. It turned out that one of the memory sticks wasn't seated correctly.
Do you have the 4 pin cpu power plugged in as well as the 20/24 pin.
One other thing I can think to try is to take out your mobo from the case and make sure its not shorting in the case.
Assemble it on a phonebook or some thing and see what happens.
Also when you try this. Take everything off the mobo including the cpu. After you got a bare mobo reset the cmos on only the mobo nothing else pluggged in. Assemble on phonebook and see if it powers up.
Did you use the brass standoffs to mount the mobo, and the paper washers?
Try with just 1 stick ram, video, cpu, and short it to get it going. If that dont work go get a 1g or 512 meg stick of ram from the QVL and try that. If ram from the QVL dont work, then try a different pci-e card.