IMac G5 17" won't boot with new RAM

I tried to install 2 GB RAM into an iMac G5 17" - the computer won't boot at all. The sticks are fine (DDR PC3200 - tried them in a different computer), I reset the PRAM, all to no avail. With the original 256 MB stick, it boots fine, but with the new sticks in either slot or together, all I get is a black screen, no tone, and the fan goes on high. The firmware is up to date. What next?

I have a similar issue with my i5 since installing an additional 4GB (2x2GB) RAM from OWC. It runs fine normally, but if I ever need to reboot the iMac, it usually hangs at a black screen and never chimes. I have to pull the RAM, reset them and then it'll boot. I wonder if there is some timing tolerance problem with mixing RAM (with Apple's Samsung pair).
This morning (after installing 10.6.6) it wouldn't come out of sleep and I had to pull the RAM again. That's actually the first time it wouldn't come out of sleep.

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    The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.  The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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    This question was solved.
    View Solution.

    ADR1978 wrote:
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    ****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
    2015 Microsoft MVP - Windows Experience Consumer

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