Freezing, glitches and weird graphics problems

My white iMac starting having weird praphics issues about year and a half ago. Nothing that was too much to deal with. Simply using expose always cleared it up and if it came back I would do the same. It seems to be getting worse. And then yesterday my iMac started getting super slow and pausing for no reason and then I got the black transparent window shade come from the top of my screen to the bottom and then a message telling me I needed to restart my computer.
After that seemed to work but I still had graphics problems screen flickering and things like this. Then freezes started happening. I reset my pram and novram with no luck. That didn't seem to help. I have 4g of memory so I know it's not that. What hardware could be causing this? Thanks
Btw using the latest version of snow leopard

My white iMac starting having weird praphics issues about year and a half ago. Nothing that was too much to deal with. Simply using expose always cleared it up and if it came back I would do the same. It seems to be getting worse. And then yesterday my iMac started getting super slow and pausing for no reason and then I got the black transparent window shade come from the top of my screen to the bottom and then a message telling me I needed to restart my computer.
After that seemed to work but I still had graphics problems screen flickering and things like this. Then freezes started happening. I reset my pram and novram with no luck. That didn't seem to help. I have 4g of memory so I know it's not that. What hardware could be causing this? Thanks
Btw using the latest version of snow leopard

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    Model Name: iMac
    Model Identifier: iMac6,1
    Processor Name: Intel Core 2 Duo
    Processor Speed: 2.33 GHz
    Number Of Processors: 1
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    L2 Cache (per processor): 4 MB
    Memory: 3 GB
    Bus Speed: 667 MHz
    Boot ROM Version: IM61.0093.B07
    SMC Version: 1.10f2
    Serial Number: W86380ERVGP

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    So far I've seen it only on my MBP (connected using Airport), and not when connected to Ethernet. It seems to be somehow connected to network problems and how VmWare Fusion is handling it. Today, when it crashed, I capture following in my system.log
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    Jun 21 18:39:14 radim kernel[0]: vmnet: bridge-en1: filter detached
    Jun 21 18:39:06 radim configd[14]: rtmsg: error writing to routing socket
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    Jun 21 18:39:14 radim kernel[0]: vmnet: VNetUserIfFree: freeing userIf at 0xbe08800.
    Jun 21 18:40:16 radim kernel[0]: vmnet: VMNetDisconnect called for port 0xbabfd00
    Jun 21 18:40:16 radim kernel[0]: vmnet: VNetUserIfFree: freeing userIf at 0xbabfd00.
    Jun 21 18:40:16 radim kernel[0]: vmmon: Cleaned up 2452 virtual main memory pages from VM 0x806c004.
    Jun 21 18:40:16 radim kernel[0]: vmmon: Cleaned up 2950 monitor anonymous pages from VM 0x806c004.
    Jun 21 18:40:16 radim kernel[0]: vmmon: Cleaned up 1573 user anonymous pages from VM 0x806c004.
    shortly after it the hangs started to occur and after 30 seconds machine stop responding. In mean time I was trying to ping my MBP from other machine and ping was gradually increasing from 1ms - 150ms and down again, until it stop receiving answers.
    I'll post list to this thread to VmWare forums.

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    Hi, I will have had my iMac for two years on Thursday (Christmas present, in a way) and it is currently starting to exhibit some weird graphical problems, horizontal lines are appearing in various applications, at random times, but the weird thing is that they stay in that app when i move the window around and I can take snapshots of them. I posted some to my MobileMe Gallery: http://gallery.me.com/mam693#100105
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    To reinstall Mac OS X:
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    Click Options.
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    If you want to erase everything on your computer and reinstall Mac OS X, select “Erase and Install.” You can’t recover erased data.
    Click Continue.
    Click Customize to select which parts of Mac OS X you’d like to install, or click Install to perform a basic installation (recommended).
    NOTE: If you selected “Erase and Install” in step 3, you may need to use the Applications Install DVD that came with your computer to reinstall your iLife applications (GarageBand, iPhoto, iMovie, iDVD, and iWeb). If you are prompted to use the Applications Install DVD, insert the Applications Install DVD, double-click the Install Bundled Software icon, and then follow the onscreen instructions.
    If you purchased a standalone version of Mac OS X, these installation instructions are in a PDF file located on the Mac OS X Install DVD.
    If you need to reinstall the version of Mac OS X that was on your computer when you purchased it, or if you need to restore all the software on your computer, including Apple software, third-party applications, and other printer drivers, review the instructions in the manual that came with your computer.
    If you need to reinstall Mac OS X and you’ve been using Time Machine for backup, you can easily restore your applications, files, and user settings from your Time Machine backup disk after you’ve reinstalled Mac OS X.
    Happy Holidays!!!
    Carolyn
    Message was edited by: Carolyn Samit

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