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Will flashing BIOS fix "unseen" second DIMM?

Last response: in Motherboards
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June 15, 2011 8:09:34 PM

Hello,
Old eMachines T5048 has one 512MB PC-4200 DIMM and one 1GB PC-5300 DIMM (PNY). I swapped in another 1GB PC-5300 (Rendition/Crucial) but the BIOS doesn't see both DIMMs. The Rendition DIMM works by itself but not with either of the other DIMMs. Will flashing the BIOS fix this?
June 15, 2011 9:03:03 PM

Probably not. Are you sure you do not have a bad RAM slot?
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June 16, 2011 6:22:01 PM

The RAM slots are OK -- there is a 1GB and a 512MB DIMM in them now. When the new 1GB DIMM is installed, the BIOS won't see either one of the 2 existing DIMMs, no matter which one is installed.
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June 16, 2011 8:16:33 PM

That's pretty weird. I guess you can try flashing your BIOS but I don't think it will help.
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June 17, 2011 1:44:56 AM

Maybe you got a bad stick of RAM?
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June 18, 2011 2:31:38 AM

Hi,

Flashing your BIOS unfortunately will not fix the problem.
You were using two different speeds of memory and with different specifications/voltages. Try getting the exact duplicate of the first 1GB stick. If that doesn't work, and if you know how to get into your BIOS and it has a memory tester, use it. You might have fried the memory controller...

Does your machine boot at all? Can you access the BIOS?

Cheers,

Greg
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June 27, 2011 1:18:51 PM

Thanks to all for your responses. I got another 1GB stick and that worked with the other new stick. My guess is that the original 1GB stick runs happily clocked down to match the PC-4200 stick, but does not work at full speed when matched with another PC-5300 stick.
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