2gb pf RAM the limit?

i recently ugraded my ram from 1.5gb to 2.
i did this buy buying a single 2gb RAM chip.
now the issue is that if i put one of the other ram chips in with the 2gb (so i will have 2gb+) the imac will simply not boot.
i was under the impression that a intel core duo imac (2ghz) can hold more than 2gb.
even if i am wrong can putting more cause it not to boot?
thanks for your time.
intel imac 20" Mac OS X (10.4.8)

They may not be completely seated, try reseating the 2GB in the slot closest to the display and 1GB in the other. It takes a good shove with both thumbs to seat them.
The Core Duo's only support 2GB = 2x1GB, but it should still work with 3GB.
http://support.apple.com/specs/imac/iMacEarly2006.html
My second 1GB module is on the way now to upgrade currently 1.5GB to 2GB
17" iMac Intel Core Duo - 1.5GB Ram - Mac OS X (10.4.9) - Maxtor 300GB FireWire - Creative Inspire 2.1 - 2G Nano

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If I put my original Hynix 512MB memory back in, the sluggishness is gone, but it still runs like a machine with a low amount of memory.
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Hello!
I have a few more questions...
I only have 2 internal drives...
(one 300GB which is the main one that runs the applications and one 60Gb used as extra storage mainly for my video projects)
Do I need an ATA/133 PCI controller card for them?
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(meaning will it actually make a difference in speed or not?)
or do you only need one of those cards if you have 3 or 4 drives?
also,
would adding more RAM (up to the 2.0 GB limit)
(my comp is currently at 1.25 GB)
make a huge difference?
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if i upgrade it to the 1.8 GHz
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will it be a major improvement?
i guess I'm asking if i would benefit in upgrading
everything:
the RAM,
the processor,
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p.s.
I know I posted this somewhere earlier,
but I'm just so anxious :/
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Hi-
You don't need a controller card.
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Hi All,
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http://www.barefeats.com/harper12.html
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http://www.barefeats.com/harper3.html
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http://www.geekpatrol.ca/blog/150/
http://arstechnica.com/articles/paedia/cpu/x86-64.ars
http://en.wikipedia.org/wiki/64-bit
http://www.geekpatrol.ca/2006/12/eight-core-mac-pro-benchmarks/
http://arstechnica.com/articles/columns/mac/mac-02172004.ars
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This question was solved.
View Solution.

Hi:
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