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3 beeps troubleshooting
Reseat the memory.
Make sure that the contacts on the memory and the socket are clean.
Try removing one bank of memory modules at a time. (Some systems can require a memory module in Bank 0.)
Try using memory modules from the same manufacturer with the same part number and speed.
Check for a faulty memory module by trying the memory in a known good system.
If using an add-in graphics card, reseat the card.
Make sure a compatible processor is installed.