Laptop connected to AC, with freshly installed W8.1 with latest drivers available on the site, latest BIOS too. Inside the changes are the 4GB memory module (was thinking it might be that tested it with memtest86 - ran for 2+ hours with no problems), and A-DATA SP900 SSD.
Then I thought it might be GPU or overheating (even though I have not ruled that out completely, since I was more or less away from it when it happened couple times) but it ran Unigine Valley for two and a half hours with no issues and 68*C according to GPU-Z.
[Update] Ran OCCTPT in PSU testing mode (both GPU and CPU usage), temps are kept strictly under 70*C, power under 15W (since TDP is 15) and clocks are dropped to about 1.22GHZ on cpu and 850mhz on GPU. So I cant imagine that it can overheat with that sort of control. Something else probably can, but all the temps HW Monitor can actually check are good.
It's not the LCD cable, since position does not matter and reboot (4 sec turn off/on) fixes it. Though sometimes after reboot wi-fi does not work and I need to go to network connections and turn it off and on there for it to work. So might be somewhat power saving related. Since the first time it happened it was idling in chrome with no activity on wifi, and wifi was not working after that reboot. But next time it happened when I was making system backup with built in W8 utility to a NAS via Wi-Fi. And Wi-Fi worked after that.
Windows system event log has pretty much nothing of interest in it before reboot, stuff like system restore points do not need to be updated e.t.c.
So to sum it up, last 3 times it happened : Chrome was opened with a blank page and I was away from it, next time I was reading stuff from a website and it just did that, and the last time system was creating a restore image of the hdd and I was away from it.
Here's how it looks in static : http://imgur.com/h52IxaF and here's a video of it in action :
(Please visit the site to view this video)
You can sort of see some parts of the desktop through that and some regions seem to look just like random garbage.
Apart from drivers and DX/VC++ there are Nod 32 antivirus v7 installed, Chrome, and Classic Shell start menu.
On the agenda have gpu-z and coretemp/speefan run in background with logging enabled to check for temps when it happens, and well reinstall W8.1 if everything else fails.
It would be awesome if someone can point me to the root of the issue or at least where to dig for it (software/hardware e.t.c.).