During regular hard drive maintenance via the standard Mac Disk Utility, the power went down in my area - shutting off my Mac at a critical moment. Since then, it powers on but then shuts itself back off after just over 1 minute. I get power to the hard drive and super drive b/c can hear the hard drive searching for files, and it seems that the SD searches for a CD. But... No chime. Only the silent, gray screen with the 'wheel of death' sucking my hopes dry. With the keyboard hooked up, I get no numlock light or response when I try SHIFT, OPEN (CD Drive), etc. The RAM was upgraded today @ both slots to 1GB total, so RAM can be ruled out. Plus, there's no error beeps. Removed Battery for 1 minute and re-installed. No change. I honestly know a lot less about Macs than PCs, so I am wondering how the boot process works. If there is no hard drive or a corrupt hard drive, would this scenario be created by one of those? I asked myself that if I installed a different HD, would it boot properly? I wouldn't think so, so my best guess is the logic board was damaged. I don't want to get a logic board/base combo or board (eBay) if it's something more simple. Thoughts?