Start-up error: Fuzzy graphics then freezing

Hi Guys,
I've had my lovely iMac for about a year and a half now, and everything's been fine until recently...
My iMac is having issues starting up properly. Every time I turn it on there's all these funny graphics errors all over the screen, small orange horizontal lines flashing about at random. When the grey apple logo appears that tends to be jittering about as well, all in all looking like some mad graphics error.
However it's still starting up at this point. It usually gets to the log-in screen and then freezes before I can type my password in. If not then, I can type in my password then it'll freeze when I click Ok.
I have to hold the off button to turn it off and restart. Typically after 3 or 4 times of repeating this it works perfectly normal and the Mac seems to know nothing of it happening (no error logs that I can find).
I'm not entirely sure, but it seems to of happened quite recently after I installed 10.4.7 through Software update (no problems with downloading or installing it) - but it's also worth noting that I installed another 1GB of RAM about a month ago, but it was fine until recently.
I've (annoyingly) lost my Hardware Test CD, so I can't tell if it is Hardware issues or Software.
I just think it's odd that it works after a while...
Any help would be appreciated!

Welcome to the discussions!
It really sounds to me that you have a bad video board. Since you do not have the CD to run the test I would take it in to your Apple Store.
Before you do that, check to see if you are covered under the Repair Extention Program. You iMac is the right vintage to be one of the ones effected. Mine was so I took it in and had it back with a new midplane and power supply in just three days. No problems since.

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