How to fix dell optiblex boot problem?

[cgothicpenguin]

I recently bought a computer online and it has been working just fine until today when during the normal booting of the device that a screen appeared that "no boot device available" and to either press f1 or f2. Please help the computer was recently bought so i doubt it might have been the hard drive but it could and i don't know what to do? is there a way i can fix it by myself or do i have to seek extra help from a professional.
Computers info:

Dell Optiplex GX620 Intel Pentium 4 2800 MHz 40Gig Serial ATA HDD 1024mb DDR2 Memory DVD ROM Genuine Windows XP Professional Edition.

 

[Dark Lord of Tech]

Do you have any usb devices attached to the computer?

 

[cgothicpenguin]

No I have nothing attached to it

 

[Dark Lord of Tech]

Did you check the boot order in the bios to make sure the hard drive was first

 

[Ubrales]

Make sure that there is no DVD in the optical drive.

 

[al man]

Check at BIOS if it's recognized first, then as Area51reopened said, ensure it's in boot sequence.

If ur familiar with hardware, check underneath the hood.

Check HDD power & data cables are plugged in to the system board.
Try switching DVD's ports & cables with the HDD to rule out a possible MB issue (either port or SATA controller issues in Chipset).

& if u have another PC, swap HDDs, that's always a reliable way to isolate hardware problems.

See if that helps, let know how u make out
Try