G5 iSight monitor dims

have just noticed that the monitor on my G5 suddenly dims after being switched on for a few minutes.
the light is set to brightest and the dim monitor before going to sleep is un-checked. is there anything else or is it something terminal?
cheers

yep recalibrated, yep all is as was when i bought it 8 weeks ago, only hting i have added is the BT mighty mouse
although since i posted this i did the thing where you switch off then plug and turn on then turn on - i'm sure there's a snappier way of saying that - and it hasn't apparently done it since...
would that have helped? the test proper is when i switch it on again from cold in the morning.
thanks for your input though, i take it it is no longer snowy
neil

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