compaq machine does not recognize memory

I have a compaq sr2050 that allows 2 gb of memory to be installed but will only recognize one bank not both banks of memory. Either 1gb chip works in either slot but when both slots are used only one is recognized. I upgraded the BIOS but that didn't seem to do anything.
aclaus225Asked:
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Randy DownsOWNERCommented:
Are you using identical memory? As I understand it you can use either stick in either slot but just not together.

Looks like it should take 2 1G (PC2-4200 DDR2) SDRAM DIMMs

http://www.memorystock.com/memory/CompaqPresarioSR2050NX.html

Standard Memory 1.0 GB (removable)
Maximum Memory 2.0 GB
Memory Expansion 2 sockets
Memory Comments PC2-4200 DDR2 SDRAM DIMMs. Supports Dual Channel DDR2.
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aclaus225Author Commented:
They are both pc2 4200 sticks.
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Robert Sutton JrSenior Network ManagerCommented:
What happens when you install both sticks? Will the machine even boot? If so, have you checked in the bios to see if both sticks are at least visible there when installed? Not sure if you are saying the OS or the bios doesn't recognize both. Please clarify.
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Randy DownsOWNERCommented:
Different brands?


http://www.techsupportforum.com/forums/f210/ram-wont-work-with-both-slots-together-543163.html

Not uncommon for RAM of different brand/specs not to be compatible.It is advisable to install RAM in matched pairs.
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aclaus225Author Commented:
The BIOS and Windows do not detect both sticks. They are different providers as one came with the machine and the other was purchased at memory stock recently.  The machine does boot when both sticks are installed but only recognizes the older stick when both are installed.
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Robert Sutton JrSenior Network ManagerCommented:
I would lean towards different chipset achitecture on the sticks. Try finding one that matches 1 or the other.
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Randy DownsOWNERCommented:
Your best bet is to try 2 identical memory sticks from the same manufacturer. Maybe buy a 2nd stick or move some from another machine.

If you have another compaq sr2050 you could use its original memory

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evil-insideCommented:
If one is detected, and the other is not detected in any of the slots, it means the stick is bad. Change the memory stick.

Similar memory sticks are preferred but not a necessity.

Good Luck !!
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aclaus225Author Commented:
No I can see one or the other in either slot but they do not detect together.
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sjklein42Commented:
I agree that the memory SPD settings are probably different on the two sticks.  So even if they both were seen, the machine would probably not run in DDR mode so you would not be getting the real benefit.

Your best bet is to get two identical sticks.  The machine will run much faster when in DDR mode.

If you are interested, you can use this free program (Everest Home Edition) to examine the memory SPD settings (as well as many other things):

http://www.oldversion.com/download-Everest-Home-Edition-2.20.405.html
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