PC just locks when it wants to

[TheTopcat]

Ok sorry if this has been covered but just don't have a clue as to what the fault is apart from the symptoms.

I have a pc with 4gig ram q6600 cpu and I have installed Ubuntu 12.04 and then installed KDE I have added several applications including Compiz and cairo-dock the reason I have brought them up is that I have seen lots of problems with them on forums.

The machine for no reason will just Lock up and the only way is to power down and Power up the machine.

I am a windows user that's moved over to linux so I am new at this, I could do with some advice or help on what I can do to diagnose the problem.

any help would be great
IAN UK

[Epodx64]

Are you overclocking at all? also try running memtest86 to make sure your rams good I had some bad ram that worked most of the time but had strange random problems like lockups and just little errors with things random crashes sometimes kde would just kinda disappear.

[Frogs Hair]

Any reason why you chose Compiz over Kwin for desktop effects ? Kwin is native to KDE and I was wondering if you are having graphics problems or a conflict of some kind.

[Epodx64]

Any reason why you chose Compiz over Kwin for desktop effects ? Kwin is native to KDE and I was wondering if you are having graphics problems or a conflict of some kind.

That's a good point I didn't put Kwin + Compiz together at first glance I'd imagine that might cause some instability.

[TheTopcat]

Thanks for the response not heard of kwin before I will check that out, also I will run the mem test and get back to you all asap.

[TheTopcat]

I am doing a mem check on the system as I type, Just for one min lets say its compiz can some one please direct me to an set up guide where I can install compiz on KDE to allow applications like Cairo dock to work with out that Black Box showing behind it.

Many thanks for any help on this, as I am still getting to grips with all of this please can you give me any help in very simple steps as I have only been using Linux for 12months.

Many Thanks
IAN (UK)

[RichardUK]

I experience that on a fresh install about a year ago, turned out the new SSD I had brought was failing. Did just what yours is doing, hard locked. Power cycle only way to bring it back. After about two weeks SSD failed completely. New HD and problem was gone. So I would suggest do a backup just in case is the same issue.

[dodo3773]

The majority of the lockups I have had have always been from compositing effects. Try turning all the effects way down and see if you still have issues (or run a window manager that does not support them to test (like openbox)).

[Epodx64]

I had lockups because of bad ram before as well try

sudo dmidecode --type memory

and post it back here.

[RJARRRPCGP]

Having too high of a core OC is a common cause.