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#31
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When the Compaq Logo appears, press F10 immediately.
When you enter the BIOS - leave it there and let me know you have entered in.
1st drive none.. Second drive none.... 3rd drive ST3120213AS....4th drive HL-DT-STDVDRRW G
Set ST3120213AS as #1
Set HL-DT-STDVDRRW G as #2
Read the instructions in the BIOS, they may provide the instruction for you.
Try doing + and - (see if that works)
Press Enter on ST3120213AS and press the Up and down key - see if ST3120213AS moves.