Root Phone dead!!!please help!

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Hi,
I tried to update my rooted Android 2.1 to 2.3.4, using this thread here
after the 'launch software update' I got the sorry anddroid system cannot run...etc recurringly. After switching it off, it does not turn on again! Tried pressing camera and power on together, home and power on-nothing!
PlEASE HELP ME!

 

[cookies]

Spent so long trying to fix this, read this entire thread and seems lots of people had the same problem, couldn't get into fastboot. I flashed it again through cs_emergency and all seems fine now.
Tried to do the whole process again but still can't get into fastboot, no lg logo comes up and when the backlit screen comes up and try installing 2.3.4 it tells me to go into fastboot the last second of download, i press ok and it says its finsihed but theres no difference in the phone, still 2.1
At least the errors have gone though, but am really frustrated! Can someone please put me out of my misery!