If your computer beeps (1 beep-3-4-3) but doesn’t boot then this is often a memory related issue.

Please try the following:

  1. Unplug the power cord
  2. Remove the memory chips from the machine
  3. Make sure they are the same size and speed and inserted into the right slots (blue before green and typically inside before outside ordering).
  4. Start with one stick.
  5. Repeat these steps to add another

Often times just removing the memory and reinserting them makes this problem go away.

The actual beep codes differ by brand and model. Search specifics such as “lenovo beeps 1 3 4 3 on startup”)