Hi everyone, I'm having problems with my monitor and wondered if any of you techies out there have any idea what's wrong.

It's a 22" LG flatscreen monitor, it works fine for about 20 mins but then it turns itself off ,then back on again almost immediately, after a minute or so it does the same again,
the longer you are using it , the more often the problem occurs. after an hour or so of use, it turns off then on every 30 seconds or so. :'(
I've started using my spare but it's much smaller
Just wondered if it's repairable or in the bin! ;D