I have a dinosaur running Kubuntu 18.04 with a Gigabyte P35-DS3L 

motherboard and an Intel Core 2 duo E6850 CPU and 8GB RAM.  For a video 

card, I have a GeForce GT 520.   A few days ago it started acting up.  

Now, at random, it acts as if the video card shuts off.  Both monitors 

give a no signal message.  However, the software I had running continues 

running.  I know this because the dinosaur still plays the audio.  The 

keyboard doesn't respond. crtl+alt+backspace doesn't work.  I can ssh 

into it, but it won't reboot.  The only thing I can do to recover is to 

hold down the power switch until it shuts off, then turn it on again.

Any idea what this might be?

thanks

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