Can't boot Power Mac G5 up from anything (DVD, USB or HDD)

Hope someone can help me with this one
My mum has an old PowerMac G5, the dual-core 2GHz one (I can't remember what it is exactly) and it won't boot up anymore.
At first I replaced the hard drive because it was making some funny sounds... scratchy-ness.. then with the new hard drive, my dad was able to install 10.3 on it which booted up pretty reliably after reseting the SMU. Then I thought I'd replace the 10.3 installation with 10.5.8, so i tried to install it off a 10.5.8 disk just by booting into to 10.3, opening the disc and clicking the 'Instal Mac OS X' thing, then restarting. But the computer would just keep restarting to 10.3
long story short, the computer won't even turn on now. The light next to the power button doesn't come on, but the fans are on and the hard drive is alive. I've tried booting from the original 10.3 DVD, but that doesn't work either. The DVD drive spins up for like 20-30 seconds, then stops.
I've got one of these: http://www.everymac.com/images/monitor_pictures/apple_cinema_display.jpg and the power button light doesn't come on on that either.
The computer was working fine up until a few days ago.
I've reseated the RAM, reset the SMU, tried booting with C held down. Nothing seems to work.
Thanks in advance

Yeah, the monitor button turns the mac on, but once the comp is on, the light goes off and the screen stays black
I'll give it a go, but I don't believe so.

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