Try one of these most common key combinations durring Start up
( Delet ,F1 ,F2 , Ctrl Esc , Alt Esc ,Hold Esc Key on Power up ).
Do this rather quickly when you 1st power up your system.
If you miss the time frame press Ctrl-Alt-Delete at the same time to restart your system and try again .If you have a newer keyboard.Make sure your FLock Light is lit up durring the keystroke by pressing the Flock key 1st .Some keyboards dont Auto power on this feature durring bootup.
Thermaltake Armor A90
Corsair HX1000W PS
i7 2600k / Cooler Master Hyper N 520
Asus P8Z68-V Pro / Gen 3
8 GIG Corsair Vengeance
eVGA GTX 570
SB Audigy2 Platinum
Kingston Hyper X120 SSD
WIN 7 - 64b
LG Blue Ray Super Multi Burrner
Logitech THX Z560
3x120mm - 1x200 mm case fans