Everytime I power down my iMac, and boot it back up, the date is set to December 1967. Wtf? iMac DV 400. Also happens when I boot from Mac OS 9 to Mac OS X. What key do you hold down on startup to zap the PRAM? Any other suggestions would be helpful.
To zap your PRAM you press Command-Option-P-R Also I think it could be that your internal battery could be gone. Is your machine always plugged in or do you use a power bar and switch off the power to your machine each time? What happens when you put it to sleep and wake it up? Try the PRAM if not maybe the little battery, small battery but it can cause problems.
15.4" MacBook Pro 2.6 Ghz i7, 8GB, 750G, I gig video card 10.8.4; 32G WiFi iPad, ATV 2, & 16 gig iPod Touch
My iMac is plugged straight into the wall, not into a power bar of any kind. I choose 'Shut Down' from the menu bar to turn the iMac off, and hit the power button on the front of the iMac to boot it back up. I'll zap the PRAM and see what happens.