Strange colours on screen after upgrading memory.

Hi all.
I bought a 2nd hand eMac from eBay and have just received a 512MB SDRAM module to upgrade the memory from it's current 384MB to 768MB.
On the first install I removed my 128MB module and installed the 512 module - No Boot. (beeping on startup)
I thought I'd try the 512MB module on its own - No Boot (again beeps).
I then tried just my 256MB module - Booted fine.
I then tried the 512MB module on its own and it did boot but this time the display colours were very off (the apple logo in Tiger was pink for instance)
Last of all I took out all ram and reseated it all - Success finally.
Now my questions are:
Were the beeps a memory error warning (I assumed they were)?
Is the display issue possibly related to poorly seated memory?
I do have big hands and found it difficult getting the ram in the eMac, especially with the sharp(ish) mesh on the underside of the eMac.
I feel this may be related to me seating the memory poorly but that time it booted with the colours all screwed has me worried in case something more is wrong.
I'm currently testing the memory with Remember and all is fine so far (I'm up to the 256 block sequential test so far)
Thanks for reading and apologies for the long post!

Thanks for the suggestion srojtas.
The eMac has been running fine since posting this and completely passed the Remember memory test. I also tested it by filling the memory up by opening many apps and it didn't crash at all there either.
The eMac didn't come with a hardware CD sadly, so I can't test it that way!
I feel now it must have all been due to me not seating the memory correctly.

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Thanks for the suggestion srojtas.
The eMac has been running fine since posting this and completely passed the Remember memory test. I also tested it by filling the memory up by opening many apps and it didn't crash at all there either.
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