Problems after RAM install on 450mhz iMac DV+

I've been trying to upgrade my old iMac DV+ First, I installed Mac OS 10 on it and although it installed, after looking in the system profiler, I discovered my machine had only 64mb of ram and 10.0 really needs at least 128. It also still has OS 9.2. Needless to say, it was barely functioning. I purchased two 256 mb Kingston SDRAM, 168 pin PC 100/133 today and followed the install instructions on Apple Support. The machine booted up on the second install attempt (the first time, I hadn't pushed the RAM in quite far enoungh) and the desktop looked normal "About this Mac" showed the 512 mb- success- I thought. Then, I tried putting in a Tiger install disc that my school gave me because they had an extra license. Before trying to install Tiger, I decided to check how many gb I had on my hard drive, so tried to open system profiler to check the specs. My desktop displayed some very un-mac-like black block/white print error messages and the computer froze. The Tiger disc was still in the computer, so I restarted again with the mouse held down and the disc ejected. I got the flashing question mark folder for a few seconds, then a blank screen. I had to shut off power. I've tried re-installing the RAM, taking it out and putting the original 64 back, resetting PRAM, and now I just have a green light, no question mark, and a gray screen. Any suggestions? I don't have much on it that isn't on my other machines. Can I go for a clean reinstall? Is it the RAM or something else? I'd hate to lose this machine, as it still could be very useful in some ways.

First, you need to install a firmware update. This must be done when booted directly into OS 9.1 or higher, but not OS X.
You will need a minimum of 128 MBs of installed RAM for OS X and 256 MBs for Tiger (10.4.x.)
OS X will require at least 6 GBs of free space during installation and at least that much additional free space should be available on the hard drive. The hard drive must be formatted Mac OS Extended.
You certainly can do a clean install. In fact I would recommend that.
Given the age of that computer you may need to replace the internal PRAM backup battery if it's never been replaced. It's a 3.6 Volt, 1/2 AA size lithium cell available at Radio Shack, battery specialty stores, and some photo supply stores.
In the future you should post questions about iMacs in the iMac forum. This forum is for Intel Macs.

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Problems after RAM install on 450mhz iMac DV+

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