Getting a White Screen at Start Up/no power is getting to any external devi

A few months ago, I purchased an older Mac Mini (Power PC) for my husband. Now when he tries to start the mac mini, he is getting a blank white screen. I also noticed that no power is getting to any external devices that are connected to this mac mini. During the startup, there is a quick flash of power to the keyboard and that is all. I have tried to following:
1. Full Reboot of the computer
2. Reset the RAM
3. Reset the PRAM
4. Reset the PMU
Still not getting any power to any device and still getting the white screen. On a side not, I can hear the computer starting up and I am getting a light on the mac mini.
Does anyone have any other ideas? I do have an appointment with the Genius Bar later this week. I am just trying to decide if I need to buy him a new computer or if this can be fixed.
Thanks for any feedback!

So does the mini make a normal chime start-up sound that all Macs make when starting up?
Does it go straight to a white screen or does it make some intermediate screens, like gray, gray with a spinning wheel, blue...anything?
Have you tried starting in Safe mode?
http://support.apple.com/kb/HT1455

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