Mac OS X - PMU reset on the iMac G5

**Stephanatic** · 22-01-2009

Dear MacUser,

I have a little problem with my iMac G5 with OS X. I would like in safe mode (or whatever this means) and go to do something. Only problem is, if I use the buttons for the mode, press, then it remains so, and said the fans are turning full throttle.

My question: Why does it and why are the fans turning the gas?

**PreatORiAn** · 22-01-2009

PMU reset and reset pram, and then again restart?

**Leonard23** · 22-01-2009

The P ower M anagement U nit is a computer in the computer. Adjusts the power management.

If a Mac times for no apparent reason spins (freezes, is unstable, etc.) is recommended in addition to an unsuccessful PRAM reset (APPLE + ALT + P + R when you start hold) once the PMU reset.

Eg: I have a firmware update on my iMac Bluetooth module "lost" and could be a PMU-Reset again.