"System extension cannot be used The system extension "/System/Library/Extension/IOStorageFamily.Kext" was installed improperly and cannot be used"
- boot from your original system disc
- plug one of your usb flash drives
- see if installer software could use usb flash drives as target for install
( testing your usb flash drive from a know good system software )
- DO not perform install on flash drive , just need to know if flash is usable
if it could , re-install your system or if it was updated from a previous version re-install 10.6.8 combo update
checking for any missing update ?
first shut down your imac by pressing start up buttom for more than 10 second
unplug all peripheral , usb drive , printer ... ect
then startup again and see if universal no sign and the spinning circle come again ?
if yes then put in drive your system disc 1 , shut down , start up again but just after start up sound hold C key at
keyboard to start from system disc , folow at screen instructions to install your system .
then one more time update your system to last possible version , using system software update from apple menu