Upgraded iMac G3/233 now the monitor flickers?

I wanted to upgrade an original iMac Bondi Blue for a friend but after installing everything the monitor flickers? I added 256 of ram (2 x128) and a 8gig hard drive (5400rpm) both adhere to apples specs. I think I may have ensembled something wrong which is causing it to flicker but I'm unsure. I think it may be the CD drive since I found it to be a little loose for my liking when I inserted it back (2 claps seems hardly enough). Is there anyway of tell if I did install it right? Maybe there is something I didn't hook in?
Any help would be great.
Thanks in advance, Shane

I'd suggest going back over the process of disassembly and reassembly, to make sure that everything was returned to its original state. Check the cabling that you detached and reconnected, to be certain that every connection is snug. If you haven't checked it out, this web site is a useful reference for upgrading the tray-loading iMacs. It seems unlikely, but the video flicker may be coincidental and unrelated to the hardware upgrades. Hopefully, you'll find the source of the problem and rule out a secondary hardware issue.

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Upgraded iMac G3/233 now the monitor flickers?

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