Won't wake up and beeps when trying to

After my computer has been asleep for a while, and I try to wake it up, it will not wake up. Instead, the screen remains black and a loud beeping occurs. I let the beeping go on, thinking it will end, but it doesn't. The only way I can get my computer to work is to turn the power off on the power strip I have my computer plugged into, then turn it back on and turn on my computer. It seems to be fine after that. Can anyone tell me what the beeping means and how to fix this? Thank You!

Beeps on startup:
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images.
5 beeps = processor is not usable
http://support.apple.com/kb/HT2538

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