Page 1 of BenQFP783 Screen on the blink?Shutting down

I have a 9 month old Benq783 TFT monitor.I had a recent trojan attack from spyqq.a.I reformatted the disk and removed all traces from my machine.However the monitor during the attach would shut down every 14 mins.Shut down means goes dark,the power light would remain green.Before going to shut down the screen would go light and dark instantly.The PC was unaffected in anyway.To recover the screen switch off power for five minites and them switch on with no problem.All machine setting are reset and drivers reinstalled.No hardware clashes seem to be present.It now (post this work) shuts down from 40mins to 70 mins..strange but frustrating.Though initially it maybe a heating problem but now mistifyed.

Any ideas or is this a garantee job?

Well the virus would not have had anything to do with your monitor problem. It looks like the typical case of faulty backlight inverter so it`s a "guarantee job".