Trouble adding RAM to old board

Hello,
I have an old SI7 MS-5124 with a pentium processor. I currently have 4 x 8MB EDO which I - obviously - wanted to increase. I bought 2 x 32MB EDO and inserted them instead of the four old ones. When I turned on the power the machine refused to boot. It just gave me the "ticker"-sound a couple of times, beeped 4-5 times but remained black. Nothing ever appeared on the screen. I took them in and out, switched them...nothing! Then I re-installed the four 8MB-modules, and everything worked just fine again.
I am completely ignorant when it comes to hard core setup, so could someone please give me an explanation for absolute dummies concerning the possible cause of this problem.
Thank you  )
Landers

These old board usually have a DIMM voltage jumper setting (3.3v / 5v).
99% of the sticks use 3.3v so check it out.

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