Just tried to upgrade to SnowLeopard with new software. iLife failed to download and now the computer will not start up--grey screen with lines going round and round in a circle. What can I do to get it to start up?

Just tried to upgrade to SnowLeopard with newly purchased software disc. iLife failed to download and when I tried to restart the computer, it will not do so--just get a grey screen with the lines going around and around. Any ideas about how to get it to start?

Mac Pro - Mid 2010
Processor  2 x 2.66 GHz 6-Core Intel Xeon
Memory  8 GB 1333 MHz DDR3 ECC
Graphics  ATI Radeon HD 5870 1024 MB
Software  Mac OS X Lion 10.7.2 (11C74)
This is a brand new machine that I just purchased from Apple. It was delivered yesterday
The old computer is an old PowerMac G5, but my OS X install disc is a retail version of 10.5.
I also tried the OS X 10.5 install disc that came with my MacBook Pro (2.6 Ghz Intel Core 2 Dual).
Same issue - nothing but a grey screen when the system tries to boot from the DVD

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