Can random hangs be caused by a faulty video card?

Hi all,
I have an early 2008 MacPro, running X.7.5, and it has a video card that has been acting up. For years, it has been putting up random patterns of garbage which I generally ignore. The other day I came back to the machine to find the screen black and littered with various inconsistencies. Had to reboot. Then, as I was working normally the computer hung while I was in Finder and moved the cursor over the dock.
I guess I should do something. Would the hardware test tell me anything on this?
Anyone remember how to start up into the hardware test?
Thanks, and so long for now, Tom

HI Grant Bennet-Alder,
I appreciate all the input. I have read the pointers you recommended about the choices and done the research, but, I really need a lower power, lower performance card(less fan, 2D graphics not video), and so I am looking at the Nvidia GeForce GT 120 as the budget alternative. It first shipped with the MacPro4,1, but I want to install in the MacPro3,1 and use X.7.5 or later and I want to be sure it works without any draw backs. Can you tell anything in this regard.
Thanks, and so long for now, TOM

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    Switching out my Nvidia 9200 GT with the 8200 on-board graphics
    A different network card from my on-board (wired)
    Different hard disks -- the Windows and Linux installs are on different disks (one is IDE, the other is SATA)
    Swapping out my 2GiB RAM stick with two other RAM sticks (512MiB each) in every slot
    This leaves only my PSU, CPU, and motherboard as possible culprits after help from the #archlinux channel in narrowing down the above. Where do I go from here? I haven't any idea how to check the health of my motherboard and CPU, but I see no extra slowdown when I run Folding at Home on one of my cores (it's a quad). Whenever I reboot to my BIOs and look at the voltages my PSU is putting out, everything seems to be okay.
    I've had the same hardware since last Christmas when I upgraded my video card. It worked fine somewhere in July, IIRC, when this all started. Can anyone offer any help? I haven't any idea what I should do next.
    Last edited by Nathan (2010-10-23 02:41:46)

    I've tried three different graphics cards. One is a new Nvidia 9200 GT, which I just got for Christmas. Another is the Nvidia 8200, which is an onboard chipset. The most recent, which is installed right now. is an Nvidia 8800 GTX. Although it seems to happen less with the GTX, it still happens somewhat frequently. It was worst with the onboard.
    I'm wondering if I should try stripping out my HDDs and installing on an old IDE disk I have just to be sure, even though SMART says both disks are fine.
    mprime has been running for 21 hours and no issues so far, although I do have a large box fan pointed at the open CPU case and a smaller one pointed straight at the CPU
    EDIT: Another thing I've been wondering if this would be at all possible caused by my router. My router is quite crappy -- an ancient Belkin running DD-WRT, but it barely has enough RAM to do that. Everything but the essentials is turned off. Do you think this could cause it? My dad's computer, attached to the same router, is also having problems, but that computer has had the same Windows XP install since about 2002, so it's not a great benchmark. Wondering if it's worth checking out though.
    The reason I say this is because I notice the hanging / slowdown mostly start in Firefox / Chrome / Pidgin when using the network then spread to other components. Also, I am connected to it via a *really* long (200ft I think) CAT5e cable. Could this be a problem? Should I try to throw in a wireless card and see what happens? I didn't have problems with it when we first installed it, but that was a while ago. Come to think of it, it may be about the time that the slowdown started. Could that be the culprit? I'll probably try a wireless card tomorrow and see what happens.
    Last edited by Nathan (2010-10-12 01:01:09)

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