Did not update firmware before installing tiger now imac wont turn on....

I bought tiger for my imac dv g3 400mh computer and bought additional memory from crucial so that it would load on.
I got a message on screen saying that I needed to update firmware and to restart my computer which I did and now it will not turn on. The power button is on but the screen is blank.
I have read an article posted on here and I tried everything (the sleep/wake trick)etc but it still will not work.
any help will be appreciated.
joby

Welcome to Apple Discussions!
Fortunately your Mac has a VGA port in its back panel, which should work to connect an external display while you apply the firmware after the fact. So find someone who has a VGA display, and download this firmware update and apply it while booted off the hard disk.
http://www.info.apple.com/kbnum/n75130
It is only the internal display which goes dark if the firmware was not applied before attempting to install 10.2 or later.

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