Hello, having trouble with my monitor. Every time I switch it on, it powers up as normal for 1-2 seconds and then goes black as if it's in sleep mode. It has been doing this for week and is completely disfunctional so I can't use it and it's really frustrating. Anybody know what the problem is/how to fix it? I have been told it could be a 'backlight' issue. Strictly speaking it's not a monitor, it's a television. The model is Samsung SyncMaster P2270HD. Many thanks in advance.