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Hi , Welcome to JustAnswer Thanks & Regards Satchi
could you please explain the problem little more
``start up test`` failed
``boot device not found`` (3f0)
This error comes when the hard disk fails to detect during boot up
Reboot the computer and press F1 or DEL to enter BIOS setup
There look that the HDD is detected or not
HHD can not see
then the HDD needs replacement
http://www.amazon.co.uk/500GB-inch-SATA-Internal-Drive/dp/B00C9TECFO You can get one from above
Then from below video you can replace the HDD
Let me know if any issue ...