[Markly Darkly]

Just recently I've been getting occasional crashes - usually the screen just either:

Goes black and monitor says "Entering SLeep Mode"

Lots of weird graphics everywhere, eg screen all grey with moving stripes etc.

Sort of double image/ low resolution effect.

I think that whilst this is all going on the computer is still working. I know this because with the third effect, I can still navigate the mouse/arrow ti close everything down, rather than using the reset button.

Graphics card is a GeForce 3 and I have the very latest driver (have done for some time).

Any ideas - could it be a dodgy graphics card - any other way of testing?

Thanks