Question about memory compatibility

Users questions: My computer used to be 256 memory, and later bought a 512 memory. I have two memory modules installed in your computer, but now the system shows only 512 of memory, it seems that 256 is not used, what ways can use these two memory so that memory into a 768, but not The compatibility problems, thank you for the information
Experts answer: too simple, so I do not know how much your motherboard can support memory following what I said is that your motherboard supports 768MB of memory, in the end whether to support, depending on your motherboard manual can not be detected 256MB of memory, is generally not plugged in You remove the 256MB of memory, with light finger eraser, clean up the memory slot, then plug it back in, to insert firmly seated, reboot, see if can display properly. If does not work, try replacing a memory slot. Or 256MB to 512MB of memory and the memory swap. If Not yet, what bios you restore the default value, and then try again. If does not work, you get 512MB of memory down to see whether the computer display 256MB of memory. If the display shows both the memory is not compatible, you can switch to a different slot or swap solution. If you can not start, note 2 56 of the memory corruption. default bios recovery method: boot or restart the computer holding down DEL key to enter the BIOS. find LoadFail-SafeDefaults, press the arrow keys to select the carriage return after, you are prompted to determine, according to Y, Enter. the last choice Save & ex itstep (Save Settings), you can directly press F10. by Y Enter. automatically restart. is set up!
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