Philips LCD Monitor

Assalamoalikum to all friends

I have Philips 170s 17" LCD monitor.The problem i was facing was that it suddenly powers on & off ...and not remains in a steady state like when i turned it on it turns off automatically and then turns off and on again and again .I gave the monitor to a local Repair he took 900 to repair and said there was a Power Card in it which was not working so he replaced it.But now after few days I m facing this problem again.Does anyone know here why this problem is occuring and how to resolve it.I shall be really thankful to u ppl.

Please Someone Reply I m in real Problem due to this issue !!