I've recently built a machine with the following components:
AMD Phenom II X4 840 3.2GHz processor
Asus M4A88TD-M EVO motherboard
PowerColor HD 6850 1GB graphics card
2 x G-Skill 4GB DDR3 1333MHz memory
Whenever I first boot the machine (each morning when I get into work), black horizontal lines are visible across the BIOS splash screen and also across the display when I see the hardware/memory checks etc. After the Windows loading screen (it's Win 7 Professional 64 bit), no video signal is output at all and I have to hard reset.
However... second time around, after the hard reset, it always boots fine with no problems whatsoever. As it only affects a cold booted PC, might it be somehow linked to the CPU temperature? If so, how would I resolve this?