PowerMac won't boot after power failure during install

Hi, sorry if this has been asked. I searched, but I'm not quite sure how to phrase it.
I bought a used PowerMac from craigslist and went to install a newer version of OSX. I had a power failure in the middle of the install and now the computer won't boot up. How do I go back to a fresh re-install and get the computer to boot up?
Much appreciated!

Did you use a retail install DVD? If you used a gray disc from another model Mac, that could be a problem.
Because of the power failure, suggest you reset the PMU. How long was the power Off? You may need to replace the PRAM battery.
Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3
http://docs.info.apple.com/article.html?artnum=86760
 Cheers, Tom

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Intel-based Macs: Resetting the System Management Controller (SMC)...
http://support.apple.com/kb/HT3964

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Hi, Nigel.
Not to differ with my colleagues here, but there's an important question that wasn't asked.
1. You wrote: "So far, I've booted from the original disc and repaired the permissions as well as the disc, then re-booted, but same old blue screen."Did Disk Utility report any errors it could not fix when you ran Repair Disk? I suggest you run the procedure specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
2. You may also want to run the Apple Hardware Test that came with your Mini to be sure nothing shorted when the power cable was removed from the computer. I've seen it happen, hence I usually recommend removing the power cable at the wall before disconnecting the power cable from the computer. See my "Apple Hardware Test" FAQ.
3. Repair Disk gives your Mini a clean bill of health, the blue screen may be the result of some Startup or Login item that was corrupted due to the sudden power outage. My "Troubleshooting Startup and Login Items" FAQ can help you pin that down if such an item is causing the problem and may help you avoid and Archive and Install.
4. If you elect to go the Archive and Install route, see my "General advice on performing an Archive and Install" FAQ for some important tips on this process.
5. As FYI, this is the kind of problem that makes one glad they've implemented a comprehensive backup and recovery solution. For advice on the backup and recovery solution I employ, see my "Backup and Recovery" FAQ. Computing without a comprehensive backup and recovery solution is like driving without auto insurance.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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Hi!
How to configure automatic boot of V240 machine after power failure? After power gets resored, V240 remains in standby mode and one has to press button on front to power it up. It is not convinient because power failure can occur, for example, at night and the machine is not booted until the first user awakens :)

Uhh... I've found publicly accessible document http://docs.sun.com/source/817-5481-11/variables.html :
Looks like this variable controls auto-power-up behaviour:
sc_powerstatememory
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Hello
Try boot in safe mode - Hold on at start-up SHIFT key , at least for one min , see if you ah safe mode start up
Try boot in single user mode - Hold on at start-up CMD-S , see if you have a comande line interface - type exit comande to try boot graphic interface
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Trouble booting up after power failure

After power failure(two hours), when booting up imac, just get a grey screen with blinking folder icon containing question mark.
I can hear clicking noise (hard drive?) that goes two or three clicks and then seems to give up.
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PowerMac won't boot after power failure during install

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