HP Compaq dc7800 USDT Troubleshooting Manual page 44

Table 2-13 Solving Memory Problems (continued)
Power LED flashes Red five times, once every second, followed by a two second pause, and the computer beeps five
times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Memory is installed incorrectly or is bad.
38 Chapter 2 Troubleshooting Without Diagnostics
Solution
1. Reseat DIMMs. Power on the system.
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.
ENWW