Error code

ASUS 54

ASUS54
POST Code· Shown on the motherboard's 2-digit Debug Display during boot.

What it means

Incompatibility between motherboard and RAM.

How to fix it

  1. Reseat RAM.
  2. Check for debris in RAM socket.
  3. Test with known working RAM.

Not affiliated with ASUS. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.