What do three long beeps when booting a PC mean?

What do three long beeps when booting a PC mean?
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Answer :

answer:When you turn on your computer, and it continually beeps three times (three one-second beeps), it means there is a memory issue. To resolve this problem, check the following: •Make sure the memory modules are properly installed in the DIMM slots, and that they are pressed in completely with the latches locked in place. •Make sure you are using supported memory for your board. Verify speed/size of memory. •Check that the memory modules are not defective: ◦test memory modules one at a time. ◦Try modules in another computer or try different known-working modules in this system. http://www.intel.com/support/motherboards/desktop/sb/CS-034262.htm
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