Hi, I installed Debian 4.0 + ISPConfig through the perfect setup. It has crashed about 3 times in the past 24 hours and I don't have a clue how and why. The complete system freezes and the only way to recover is to turn the server off and on again, then it will boot fine. When it freezes the harddisk LED is on everytime. I really want to solve this but what am I looking for? What logs to check? What things to test? I installed the SMP kernel and it ran stable for about 2 weeks, all of a sudden it keeps crashing every now and then. The only thing changed is the CPU fan of 1 of the CPUs, it runs fine and keeps the CPU cool enough (can touch the copper parts of the cooler and they are just warm, not hot. Please help me out.