I had problems doing a fresh install of Panther on a friend's Dual 1GHz G4, 768 MB, Superdrive, 60BG HDD (M8667LL/A I believe). This box had previously been upgraded from 10.1 to 10.3 but I thought clean install might clear up the occassional problem my friend was having. The fresh install did not go smoothly it kept failing before the end of the first CD. I tried everything to get the install to work: 1) I stripped the system down to bare bones - keyboard and mouse only 2) I repartitioned the hard disk and rebuilt the partition table 3) I swapped the Superdrive out for a newer one 4) I zapped the PRAM 5) I reset the PMU on the board Only after I removed a 512MB PC133 DIMM from the board (that I'd installed months ago and that appeared to be working ok) did Panther install and run. I guess the RAM might have been a bit dodgy... But now here's where I dicovered a problem. I put the RAM back in and power it up and I get the 3 power up tones indicating RAM failure. I powered everything down again, checked the RAM was seated properly and powered it up again. This time no fault tones but the extra 512MB of memory isn't recognised by System profiler. What's more, I noticed System Profiler is now reporting the computer as a SINGLE CPU 867MHz Power Mac G4, and not a DUAL CPU 1GHz! The "sysctl hw.cpufrequency" command reports 867MHz as does Xbench. I tried the openfirmware reset procedure, but it didn't recognise the "reset-nvram" command. I have boot ROM Version 4.23f1. I looked at the openfirmware setting last night and at least to me it appeares that the firmware isn't reporting 2 CPUs. I think in my efforts to get Panther to install I might have corrupted the firmware. Does anyone know where I can download something to reflash the firmware? I've searched the Apple site and found links to Firmware 4.2.8 update, but when I ran it it says the computer is already up to date. Any help is appreciated!