IMac EFI Update 1.3 will not install

Hello,
24'' Intel iMac (about 2 months old) running 10.5.2.
Auto updater tried to apply the iMac EFI Update 1.3, but failed. So I went to apple support site, downloaded a .dmg, ran the installer, but got the same result. in both cases:
get the iMac EFI Update 1.3 window that contains instructions. hit shutdown. hit the hardware start button, get gong, machine starts to boot, something briefly flashes on the screen (probably the updater progress indicator, hard to tell) and then machine reboots itself. after boot completes, the iMac EFI Update 1.3 applications pops up again in the exact same state as before-- there is no indication of success. SystemProfiler shows that boot ROM is still the old version.
Rinse, repeat with no sign of progress.
Any insights much appreciated.
thanks,
Joe

"...hit the hardware start button, get gong, machine starts to boot, something briefly flashes on the screen"
Hi Bob, you have to hold down the start button(5-10secs) until you hear a long tone. Then let go and everything is ok.
You'll also see the progress bar install the update, that is what the brief flash was but because the button wasn't held for a few seconds, it didn't take.
Message was edited by: musashi88

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