I have a 4850 which has been running in a PC for a year now, and boinc manager now tells me there is no usable GPU. The drivers seem to be fine and Catalyst Control Center works as if a GPU is there. I have uninstalled and reinstalled drivers, CCC and boinc manager 6.10.18 which still says there is no usable GPU. Any ideas?

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did you remember to not tick the protected mode installation?
if you're unsure, uninstall boinc and reinstall without selecting that option!

Have you tried different versions of the Video Card Drivers ???

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STE\/E

Many thanks for the tips. Yes cenit I always check the protected mode installation is not set thanks, and yes PoorBoy I tried different driver versions including the driver rollback feature.

The problem was not software but mechanical. Over time the pressure of the main power supply connector against the fan on the GPU, positioned right against each other, had caused the fan to slow down and even stop. Some of fan blades were even partly worn. I had to remove the fan from the GPU and re-position it slightly to stop the abraison occuring.

It's now crunching again on the GPU, thanks again for the help.

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