What does the error from my Apple Hardware Test mean?

I was doing some maintenance on my iMac G5 (Ambient Light Sensor) this past week and found that my Video RAM might be bad.
My first clue was that when I used the 'option' key on boot, one of the resulting screens was covered with vertical lines of about 1/16 of an inch.
My second clue was that after running the Apple Hardware Tests, iMac Version 2.5.1 (the one that came with my iMac's original 10.4 Tiger installation disks), I was told there was a Video RAM error, but am not sure if I copied it right because all the little vertical lines. Here is what the AHT reported:
** ERROR ** ** ERROR ** ** ERROR **
2ATI/1/4 113-xxxxx-117
** ERROR ** ** ERROR ** ** ERROR **
Does anyone know what all this means? When I run OS X my desktop doesn't appear to have any video problems, so I was taken be surprise.
Thanks.

Well I just wanted to chime in I know this is a little late, but I just picked up a iMac G5 for $50 that had this same problem, I would recommend you take the back cover off of the iMac and inspect the capacitors, I did and found a blown capacitor I took the logic board out took it to a local PC repair shop and for $35 he replaced the blown cap. They don't have to be completely blown to mess things up just domed or really anything other than flat. I came home put it back together and everything works great. just something to consider I mean for 30-50 bucks what could it hurt otherwise if no blown caps are visible then your video chip needs to be reseated and I don't know what to tell you on that.

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