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Internal hard disk drive found to resolve this issue, try to reset the drive No bootable devices strike f1 to retry boot ,f2 enter set up menu f5 enter psa

Hi!

Please clarify. Do you mean you're getting an error that says "Internal Hard Disk Drive not found"? What Alienware model do you own and what are the specifications?

I would recommend you start by running an ePSA test. 

Update the thread with the information and let me know the results of the test.