Sounds like it reset. Enter CMOS setup (DEL on a lot of motherboards at the post screen) and select the proper boot device. (This is usually your HDD, and if multiple HDD are installed, select the proper HDD)
ok, now i have the choice to choose 3 diffrent things:
- P2: HL-DT-ST DVDRAM GH22NS50
- P6: WDC WD2500JS-75NCB2
- Setup laden / Loading Setup
"Use arrows for choose."
"Press ENTER to use a BOOT device."
"Press ESC to use the STANDARD-Way."
(SORRY because my bad english - i'm a swiss person)