Probably the back light gone or going. TP600s are getting on a bit now. Your best bet is to go through the diagnostic procedure in the Hardware Maintenance Manual. It has a really good one that you can use to prove the point. Assuming that you don't have a manual, you can download one from: www.lenovo.com. (Lenovo own all of IBM's PC assets now.) If any part of the display has gone then they tend to be an economic write-off or you could use it with an external monitor.
Terry
June 2006
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