My computer has biostar a58md motherboard athlon x4 860k processor and a radeon 7770 graphics card with 8gb ddr3, me and my grandfather put it together in the building so there was no static electricity problems all the parts are connected correctly but I have NO signal when I install the graphics plug it all in MADE sure the plugs were all secured but nothing shows up. I built this computer because I needed a gaming rig and these parts were compatible according to pcpartpicker I spend 225$ and I cant even boot up to bios it just says no signal on the hdmi2 channel on my tv ((tv=monitor.)) Please help!!