Monitor failing

Just before our vacation my old Gateway EV700 had a problem starting. I disconnected the power and the next evening I wanted to investigate the problem, the monitor "just worked(tm)". During our vacation I had disconnected my whole "development/test machines" from power and so the monitor was not switched for some time. After our vacation I reconnected the power and my old monitor again "just worked(tm)". But when I wanted to scan a document tonight, the monitor didn't turn on. The powerled turned on, but some relais in the monitor switched on and a few seconds later switched off. But no picture. I guess the old 17" gateway (build by LG) needs to be replaced...