Hello. After the solution of the previous problem here's another. All worked ok for a day or so and after then the GPU is not working by now and the above message appears.
I dunno why I have all these problems with the job computer I have 2 computers at home and they just work fine, no problem.
I have just installed a Nvidia Geforce 10150 Ti and the only day it has worked it crunched numbers at best. But now it has come to a stop.
Can you help me?

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Did you install drivers, or allow Windows to update the drivers?
Reasons why the GPU goes missing are:
1. Installed drivers without CUDA or OpenCL. The drivers installed by Windows don't necessarily contain these. Always install only drivers from Nvidia's website.
2. You installed BOINC as a service. Because the drivers then run in a separate account from the user, BOINC isn't able to see them, thus no GPU.

It ain't 2, as your 1050Ti is still visible. But it may be 1, where you only have CUDA installed but are missing OpenCL, and with all your GPU tasks requiring the OpenCL SoG application, that then accounts for "GPU missing".

You'll have to be more eloquent about what happened to your system.

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Hello, thanks, but my problem is that the GPU works for same days, then it stops with the message I posted and maybe the following day or so it works again. and i do nothimg in the meantime. For istance: it has worked since I posted the first message and now no more...

I've just recovered from a similar problem - one GPU (a GTX1080) would be OK for a few days, then stop working. Eventually it let the smoke out - I suspect the on-board voltage regulators failed as in letting the smoke out it took out a PSU. As it happens I had a spare PSU & GTX1080 (don't ask...) and now the cruncher is back working - the other two GTX1080 lived through everything. I hope for your wallet's sake it isn't something like that about to happen to your errant GPU.
(Both PSU & GPU were essentially dust free - they live under a filter hood)

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

Are you by any chance using MS remote desktop to view this machine.

If so, it uses it's own video drivers, which stop the GPU working for SETI@Home