Why does this machine periodically shut off?
I came across this beautiful machine, but it has the quirk of shutting down periodically. First, I thought it was a bad AC, then I thought it was the RAM, but I've replaced them both, and it's neither of those. It's not overheating -- iStat Pro reports very low temperatures, and even then I replaced the thermal paste to be sure. I thought it was only happening on AC power, but I left it on overnight disconnected and sure enough this morning it's off. Sometimes it goes for hours...in fact the first day I had it it didn't do this...and sometimes it shuts off within 10 minutes. There's no rhyme or reason. I'm considering replacing the DC-in, although now that it seems to happen on battery power, I'm not sure that's a likely culprit. When it dies, it makes that sort of electrical sound like it's shorting out, although I've removed the board and put it back, and I'm pretty sure everything is tight and secure.
Anyway, if anyone has ideas, please let me know. I'm not as familiar with the quirks of newer machines as I am with the old stuff.
I forgot to mention, if you look in the picture, you can see a chip on the casing of a component close to the video connector. I don't know what this is, or if it has any relevance. It does not look like the copper coil (?) inside is damaged, and there's just a chip out of the casing. However, if this is relevant, is there any chance of a makeshift repair, since it's just the plastic casing?
The frequency of shutdowns has become much more frequent, to the point now where it dies instantly when I try to power on. I hit power, and in only a few seconds I hear the electrical shutoff sound. Very strange that the machine would go from working for long periods, to shorter periods, to almost nothing. It's as if something in the machine is weakening, losing charge, losing tolerance, etc.
After sitting all night with the internal battery disconnected, it now seems to be stable, and it has survived an OS reinstall, plus a couple hours of use. Apparently whatever "bad charge" was haunting the machine has dissipated due to lack of power. However, I won't feel confident that I'm out of the woods until the machine has behaved flawlessly for at least a few days.
I was finally able to try a different DC-in, but it didn't help. However, I definitely think the problem has been defined, i.e. after being left disconnected from battery for a period of time the machine works, but then when re-connected to battery, the machine powers off more and more frequently until it is unusable.
Wow, thanks! That's interesting info...I had no idea what it was.