First check to make sure one of the memory sticks hasn't been un-seated.
If you have recently installed memory, again, check it is tightly in place.
If all memory is seated properly,and you're still getting the error, enter the computer CMOS and ensure that the CMOS memory settings are properly set for the amount of memory you have in the computer. Failing this, it is possible you might have some bad memory.

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by Cariad edited by vkr