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System doesn"t recognize all my memory, bad bays?

Last response: in Motherboards
a b } Memory
a b V Motherboard
December 5, 2009 7:16:39 PM

I just tried to upgrade memory, 4 1gb modules. system only recognizes 1gb of memory. Even in bios, 1-3 memory bank shows "not installed" I put back in the original modules, and now it says the same thing, memory bank 4 is the only one that shows installed, even though I am back to the same modules that I have used for two years. HP pavillion a1720n vista home premium 32-bit and with dual boot, windows 7 all worked well until I tried to upgrade memory. any thoughts??? installed crucial recommended ram
a b Ĉ ASUS
a c 81 } Memory
a c 236 V Motherboard
December 5, 2009 8:24:00 PM

Check for dust in the slots or modules that are not fully inserted.