I am having several major problems with my Linux machine: Kubuntu 13.10 (recent clean installl), MSI m'board (AMD Phenom II X3 720; 8Gig RAM), NVidia GeForce GT 630 video card (using kernel module 319.60). The motherborad was recently replaced roughly 3 months ago -- a local 'repair' shop fried the original motherboard while 'diagnosing' what turned out to be a software problem. CPU, RAM, and video card all tested good, so they went into the new m'board.
Problems started about 6-8 weeks ago, with only small, occasional issues, each of which I started off trying to resolve individually.
Occasionally, application windows hang, and all that is displayed is a flat, grey screen: all window decorations gone. I worked around this problem by turning off the kwin desktop effects, when I saw a message flash by as follows:
kwin desktop effects restarted... due to graphics reset
tar backups have failed to complete the last three weeks: first a "crc verify error", then a hung system, and finally a hung gzip.
Numerous dmesg messages like: "BUG: CPU#2: Soft lockup in tar". After researching this problem, I'm not sure this is a bug at all... just heavy tar/gzip CPU usage?
Google Chrome randomly and frequently crashing tabs with an "Aw, Snap" message. Google Enterprise team suggested a V8 engine error, but also hinted at hardware issues.
I'm trying to get a handle on what's going wrong and what to do to diagnose and resolve the problems. I'm guessing hardware? And if so, which component is most likely to be causing the problem and how do I isolate that? I'm going to be running a memtest86+, based on another post here.