gfn

everytime I start my computer up it goes to a black screen and says error o2b2 incorrect drive a and 2 boxes. f1 bootup and the other f10 computer setup. I have been in there to many times and nothing I do seems to help. I have reset everything to defaults. the same. moved the order of setup, nothing. always the same. getting po at this thing and gonna hurl it. please help this computer, save it from me.
it is a compaq presario 12xl504