The 3 beeps noise mostly caused by based memory read/write test error. So when you encounter this beep code, please try following troubleshooting steps.
- Troubleshooting as below:
1. Remove the memory modules from DIMM slot, clear both memory modules and slot connector especially the contact metal part on memory, then insert the memory module back to the system and power on to see if the beep codes are gone or not.
2. If step 1 not work, reseat the memory module to other DIMM slot to see if the beep codes are gone or not.
3. If step 2 not work, either, please try to swap a known workable memory and check again.