Board only sees 64M RAM per DIMM slot. Why?

[clutchc]

What would make an old motherboard suddenly only see 64M RAM per slot? I have an old MSI G41M-P33 board that was working fine when I took it out of a build and stored it away in its antistatic sleeve and back in its box several months ago. I dug it out recently to test some LGA 775 CPUs and the board now only shows 64 MB per DIMM slot. I did the usual restting of the BIOS, but to no affect.

I used new, tested memory (Gskill DDR3 1600MHZ). Everything else works on the board. http://www.msi.com/product/mb/G41MP33.html#hero-overview

 

[rockie_]

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[clutchc]

The only FSB to DRAM ratio that works is AUTO. Any manual change and I cannot reboot to BIOS, nor even get a display. I have to do the CMOS reset to get back to a display again. At that time I get a single beep and boot to BIOS where the system memory is shown as 64MB with a single stick and 128MB with two sticks.

 

[rockie_]

Oh , this mobo supports only DDR3 800/1066MHz memory
http://www.msi.com/product/mb/G41MP33.html#hero-specification

 

[clutchc]

But all I've ever used in it before has been 1600 MHz and it always defaulted to 1066 Mhz and worked fine. The memory will only run as fast as the memory controller will allow w/o OC'ing. So I doubt that is the problem.