my desktop computer wont give any signal to my monitor.

when i got it it didnt come with a monitor so i hooked it up to my tv.
It worked......
then i found a spare monitor and tryed it on that.
It didnt work......
so now i am trying it on my tv again and it dosnt work.

when i start it it loads, then shuts down, then automaticaly starts again beeping twice.


plz help
.....
Jamieip

if u have any suggestions plz say

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