My computer powers but does not show display

Hey guys....ok....heres my situation...my dad found a computer on the side of the street and let me have it....it was pretty good looking to....at first when I started it up...it would beep....long,long beeps...every 10 seconds or so....so i replace the power suply....still did it...then i replaced the ram...and it stopped....so everything fro that point was pretty good exept now im in a situation...where theres no memory test(beep at the start),and i know that the is a small speaker on this otherwise i wouldnt of heard those beeps before....and theres no display....my dad thinks its a bad m/b but i ust want a second opinion...btw the power supply it had was i think compaq(its a compaq computer)....and i swithched it out with a dynex one...help!?
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More about computer powers show display
  1. If you found it on the street, and the PSU and RAM were bad, I'd say it may have taken the mobo along with it too. PSUs can do a lot of damage when they go.
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