HP Compaq d220 MT Reference Manual page 95

Solving Hardware Installation Problems (Continued)
Problem
Power LED flashes Red five
times, once every second,
followed by a two second
pause. The computer beeps
at the same rate and at the
same time as the LED
flashes.
Service Reference Guide, d200
Cause
Memory is installed
incorrectly or is bad.
336493-004
Troubleshooting Without Diagnostics
Solution
1. Reseat DIMMs.
2. Replace DIMMs one at a time to
isolate the faulty module.
3. Replace third-party memory
with HP memory.
4. Replace the system board.
D–17