black screen with blinking cursor on startup

[Crimsonwrath22]

I just built my pc and when i start it up everything seems to start up and i can get into bios, but then it goes to a black screen with a blinking white cursor in the top left and i can't do anything else. I tried changing the boot order and booting with a win 7 install disk and a bootable usb, the optical drive seems to spin up on start up and then spins down and i get the same black screen with blinking cursor.

I have tried plugging the optical drive into different SATA ports to no avail.

Does anyone know what the issue is?

System Specs:

MSI P67A-GD65 (B3)

Intel core i-5 2500k

XFX Black Edition 750W PSU

Sony Optiarc AD-7260S DVD/CD ±RW

Western Digital Caviar Black WD7502AAEX, 750GB 7200 RPM 64MB Cache SATA 6.0Gb/s

G.Skill Sniper 4GB DDR3 1333Mhz

Tuniq Tower 120 Extreme Rev1 cpu cooler

MSI Twin Frozr II Radeon HD 6870

[glc]

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