Troubleshooting Guide
Page 44
... that do support ECC memory, Compaq does not support mixing ECC and non-ECC memory. Doing so will cause the system to blink the Num Lock LED on non-USB keyboards continuously and, if a speaker is not seated properly. Check to identify other possible memory problems. Solving Memory Problems Problem System won't boot or does...
... that do support ECC memory, Compaq does not support mixing ECC and non-ECC memory. Doing so will cause the system to blink the Num Lock LED on non-USB keyboards continuously and, if a speaker is not seated properly. Check to identify other possible memory problems. Solving Memory Problems Problem System won't boot or does...