I've had the same problem with our ancient iBook for years, and it happened on another Mac we had, too. I've always just assumed that the motherboard battery is completely dead, so the clock resets to its zero point when the power is turned off.
Buffistechnology 3: "Press Some Buttons, See What Happens."
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Good lord...this computer has already had its graphics card and logic board replaced this year. At this point Apple should just give me a whole new machine.
How old is it?
Just over a year old.
We have Applecare, but getting it to an Apple store is a huge PITA.
And the PDF that Tom linked to above has a warning that improper installation may "cause an explosion." So I'm thinking I may just live with it until something else goes wrong.
No, really, it's just a $5 watch battery. As long as you can tell the "+" from the "-" you should be fine.
Just over a year old.
If I had a computer that had the logic board, graphics card, and battery (which was probably replaced along with the new logic board) all fail within a year, I'd be looking mighty suspiciously at the power supply.
eta: The batteries that failed on my Macs took a couple of years or more to fail.
So, the other day, I was on a random website when I just closed my laptop. when I opened it the next day, the screen was all wierd and pixilated. I restarted, it seemed fine. I ran a virus check with Symantec, and it found an "unknown detection [device]" (can't remember if it was device or software), but it didn't flag it as dangerous. "detection" strikes me a spyware, but Symantec let it go. Should I be worried?
Is Laura in this thread? She and her colleagues might get a kick out of this: [link]
Thank you, Tom. I feel much better about my issues now. I'll save that for the next time my people think they suck.