I have just built a brand new computer. Everything is powered up and running: cooling system, fans, cd tray ect. When I first turned the computer on something came up on the screen and went away it was like a boot error. Now everything I turn it on I just get a black screen. I tired my old video card that works on my old computer and got the same result. My motherboard is a Z68XP-UD3. My video card is a Sapphire Radeon HD 6870. My processor is a Intel Core i5. I have 8GB Corsair Vengeance Ram (4 Slots 2GB a piece). Finally my power supply is GS700 Corsair Gaming Series (700 Watts). I'd appricate some help with this cause I really don't know what to do.
Whenever I get a blank screen like that, 9 times out of 10 it's the RAM. Try turning the system on with one stick at a time, making sure to press firmly to fully seat the module (check your motherboard manual to see if there's a specific slot you should use). Other than that, you can try clearing CMOS, installing a motherboard speaker to listen for BIOS beep codes, or taking the whole thing apart and putting it back together carefully. Good luck!