This may have been going on for a while Every month or so everything will freeze up - usually during an intensive session of design work Since I could never operate with the mouse or keyboard - I would force it to turn off by holding down the power button. I use a mac wireless mouse & keyboard during these occassions. And today I discovered that I could move the cursor with my touchpad & mbr's keys. So Bluetooth must be the culprit. I turned it off - but it wouldn't allow me to turn it back on. And everything comes back to normal on reboot Is a failing Bluetooth a sign of hardware problems?