This could be our old issues of new motherboard in old case to an overtaxed PSU.
Let's total up the TDP of the major chips than double that for safety and margin. Are we good?
CPU is 125W
Nvidia 970 is 145W
Nvidia 660 is 140W
Right there is 410 Watt so let's peg the PSU needed for long stable life at 800 Watts and a single rail. You don't have that so there's that.
For now you should downsize it to just one vid card, one stick of ram and no drives. You're going for a BIOS screen.
If this is a new motherboard in the old case the #1 gaffes are:
1. Extra mounting post shorting the backside of the motherboard.
2. A jumper in the wrong spot.
recently I have upgraded my pc, the specs are :
1, corsair vs650 psu
2.amd fx 8320 8 core (old)
3. hyper x 8gb ddr3 1866mhz x2
4.gigabyte 970 g1 gaming motherboard
5. gigabyte gtx 660 (old)
so the problem is that the display doesn't turn on and all it says is no input signal.I any tips how to fix this?