Are your monitors on now ?
See if there's an update for the video driver or you could reinstall what you have by opening Device Manager/Display adapters then right click on it and select Update driver - first to let it search online and if that comes back as already having the latest driver, right click on it and select Update driver again.
Click on Browse my computer - Let me pick and then click on the driver and then on Next where it will reinstall.
I don't know what that expired certificate is for but Avast could have problems with having repeated errors, although as you don't have a timed error date for the freeze, then it's unlikely to be the cause.
Can you go Start - type view reliability and press enter when View Reliability history comes up which may also have something recorded.
I don't know if it would be worth doing a memory test as when the RAM modules become problematic, you usually get a black screen, but if you have more that one RAM module fitted, remove all but one then go Start - type memory and press enter when Windows memory Diagnostic comes up and let it scan then do the same with the other modules to see if it reports anything.
However, if there's anything wrong with a module or its slot, when just that one is fitted, the machine may not boot up but a scan could spot a weak spot.