Newly-bought refurbished computer frequently freezes and crashes.

Dell OptiPlex 9020 MT that I have, and reuse the case?

Not easily, those dell use proprietary connectors.

The earlier optiplex 7010 were less afflicted by the proprietary disease, but still need a bit of fiddling.

Better to get a case that is ( or was for second hand ) sold directly to consumers.

SIW2 said:

Not easily, those dell use proprietary connectors.

Ah, I see. That's a shame. They have a perfect size and shape, in my opinion.

Dawid has a bash here but I am pretty sure he is using the earlier 10 series and still has a bit of a faff.

The Most Powerful OptiPlex Ever - YouTube

Cases sold direct to consumers dont need any of that mucking around.

SIW2 said:

Dawid has a bash here but I am pretty sure he is using the earlier 10 series and still has a bit of a faff.

The Most Powerful OptiPlex Ever - YouTube

That definitely looks like more trouble than I'm willing to deal with. I'm sure I'd have to look into a used Coolermaster case or something along those lines.