My samsung 753s monitor's led won't light up at all.On disconnecting the vga cable there's no self test as well..appears dead.But when connected to the pc and after 5mins or so,when the monitor's on-off switch is toggled a couple of times it comes on and works perfectly.Even on restarting it works fine,but after powering off the problem repeats.
Plz help me diagnose the problem.Which section should I suspect and start checking?

check small electrolytes in power supply primary.