As I can see the problem is not monitor but your PC if computer chasis beeping, depends on number of beeps the problem can be VGA card one long beep and 3 short or RAM if it beeping one by one short beep and finaly CPU if it continuosly beeps like police sirene. If beeps are pointing to VGA or RAM you must open computer chasis and plug out VGA and RAM and clean dust out of slots and of VGA card and RAM as well with painbrush and vacum cleaner and plug them back.
Good luck!
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