As wierd as it sounds, I was working with leopard and it froze, and when I shut it down using the button, i couldn't boot back in.. I noticed in my boot menu that my hard drive changed name from: WDC WD5000AAKS 65TMA to UDA UD400E@ 11APD0.. I can't see it in windows using Mac Drive as well.

Thanks

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MOBO: HP M8100n AMD Media Center TV PC
OS: 10.5.8 (Updated from iPC OSX86)
Kernel: 9.8.0 Voodoo Kernel
Processor: Athlon 64 X2 with Dual Core technology
MotherBoard: MCP61
Graphics: nVidia 9600gt 512 mb
Audio: Realtek ALC888: Digital Output
Chipset: Apple nForce ATA
Ethernet: MCP61 LAN (Realtek RTL8201N)