I have a Dell PowerEdge T310 server that was running fine for three years. Monday morning everyone started noticing their computers were getting slow access to the server shared drives. Logging into the server took much longer than normal, maybe 20 minutes or more. Everything was very slow on the server desktop.
Upon inspection, the server only had 8 GB of RAM and was experiencing a large number of hard page faults. Upgrading the RAM to the maximum of 32 GB - using Dell recommended RAM - seemed to solve the problem. The server booted up ok, ran quickly and was able to connect. However, users still noticed poor connection speed, and even some intermittent inability to connect.
Upon inspection (again), the server was once again going very slow. Login did not complete, and the server restarted itself. It never quite made it to the login (CTRL-ALT-Del) screen again - now it just starts up, gets almost there, and restarts.
I've put the original RAM back in, but cannot make it to a login prompt or keep the server running without it restarting upon boot.