My system does not detect the old 512 mb ram with my new 1 gb ram.

i decided to have a new 1 gb ram so that i will have a total ram of (2*512+512) MB of of ram,but after installing the new 1 GB ram my system does not detect the old 512 mb ram.
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More about system detect
  1. The new RAM might not be compatible with the old RAM. Please list your system specs. We need to know what kind of RAM you have (new and old) and which motherboard you have.
  2. You might also try looking in BIOS for the frequency of the memory. Try to change that to 2.00 (fixed for me!). If it's not works, the system cannot boot, but you can easily fix this by resetting CMOS.
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