v1.3 error
 

I have removed the LPC mod from a v1.3 after a faulty install. The xbox now boots normally but freezes at the xbox logo. After approx 35 seconds the 'service required' screen is shown & the eject button flashes red/green.

Any ideas greatly appreciated.

probably a track was scratched or broken. Or maybe a part of the mobo was fried. There are many things that could be the problem after a bad install. A new mobo (and possible an hdd if you haven't got an unlocked one) may need to be purchased.

That is what I think, I had bridged pin 2 with the via immediately next to it.