[jan-jaap]

Hardware problem?

Well, you could run the diagnostics to find out. Interrupt the boot when it says 'press ESC to ..." and you get the PROM menu screen. Option 3 starts the diagnostics.

The best way to do this is using a serial console. Disconnect keyboard & mouse, and connect a null modem cable to serial port #1. Use a PC with 'putty' on the other end, serial connection parameters 9600-n-8-1. You get the same menu at boot but on the serial connection.

If you use the regular screen to run diagnostics, the graphics tests take over the screen and you don't see error messages anymore ;-)

You've got an MXE board and it has 2 texture boards installed. If you get diagnostics results complaining about texture errors, try to re-seat them.

Otherwise: if you want a *much* quieter system and don't need the FC board in the bottom right quadrant, remove it. With an option board in that slot, the system always runs the fans in hurricane mode.