IMac 21.5" confused by RAM

Good afternoon
It is a 21.5" iMac (A1311 EMC 2389 OS 10.5.8) with factory installed RAM is running really, really slowly and seems to be confused about what sort of RAM is installed. Recognizes that there are 2 X 2GB sticks installed, but doesn't know what type or speed of RAM or that it has any memory slots in which to install RAM. See screen shot below.
Swapped RAM with another set of sticks and moved the RAM to different slots to no avail.
System Profile - Memory recognizes slots (all 4 of them) and the sticks in the populated slots and the capacity of the sticks.
Activity Monitor doesn't show any process consuming ridiculous amounts of CPU time or memory.
Running Disk Utility to see how the drive is working and though it hasn't completed yet, nothing much is requiring repairs.
Any suggestions as to what to test/try next?
TIA
Greg

Vintage doesn't mean it is "old." Vintage means the age range of the model. Each model stays exactly the same components inside and out for a period of time. That period of time is known as its vintage. Think of wine.
Let's say you went to Best Buy and bought
PNY - 2GB PC6400 DDR2 SoDIMM Laptop Memory
simply because you had a Mac laptop that had that description of RAM in its documentation, you'd think you got the right RAM because of what the user manual said for the laptop. Would that be safe?
NO!
The EMC# is one way of knowing the age of the machine. http://www.everymac.com/ shows you several other ways. Regardless it is the age that says the season and year of the Mac's release. Now there were only three iMacs that were an EMC# of 2389:
http://everymac.com/ultimate-mac-lookup/?search_keywords=2389
So you need RAM that is compatible with a mid-2010 iMac, according to the RAM seller. No other RAM will work 100% reliably. And http://www.macsales.com/ and http://www.crucial.com/ are the two vendors I'm aware of that do list RAM by the specific Apple stated vintage.

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http://www.everymac.com/systems/by_capability/mac-specs-by-machine-model-machine -id.html
I am almost maxxed out of hard drive space about 11gigs left.
That is more likely to be the problem, not lack of RAM. When free space on the hard drive gets low, the remaining space gets more and more fragmented into tiny pieces, as you write new data and delete old data. When there is plenty of free space, you have a large blocks of contiguous free space. Mac OS X needs free space on the startup volume for its basic operations. It write and reads hidden files to do things like virtual memory (used when you are low on real RAM). Some of those files can get very large, and if the remaining free space is in tiny pieces scatter all over our drive, the system may start to bog down.
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regards
mrtotes

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Using my Leopard (white) MacBook, I've dragged all my data files from the bootable PPC Tiger drive to back-up drives for safekeeping, then erased them from the Tiger drive.
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Steve M.

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