Boot failure - white screen corrupted with yellow repeated bit-pattern.

Hi
I have had a quick look at the postings esp those with pictures and can't find a similar prob to mine. My white 24" iMac hasn't been able to boot for months now, except a couple of times but it then subsequently started playing up. As well as a boot failure the white boot screen has yellow bit-patterns on it, usually horizontal or speckled. I have been able to run the diagnostics program from the OSX disc but it didn't find any problems. The computer displays and animates the spinning wheel while booting, but overlaid on the corrupted white screen, and then 99% of time gets no further.
I have made 5 screenshots with my 3G iPhone, the first two are of one boot attempt, the third is another boot attempt (note slightly different bit pattern - this one is the most common I get) and last two are of a successful boot attempt into AHT (Apple Hardware Test). If anyone recognizes this type of screen problem please do reply.
Standard boot attempt (1) - two photos showing spinning wheel:
https://files.me.com/funkypuck/e0nt8c
https://files.me.com/funkypuck/nts1nu
Standard boot attempt (2) - one photo showing typical screen corruption:
https://files.me.com/funkypuck/izjv0e
Boot into Apple Hardware Test - two photos of same area (just because 3G camera not so hot):
https://files.me.com/funkypuck/q64kgt
https://files.me.com/funkypuck/e72fkd
Many thanks

Hi, I am having a similar problem from what you described, but I can't even get the disk up and running for a clean install with Snow Leopard.  I'm curious if you have found a solution.  I fairly certain that it is not an issue with the hard drive. 

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