Bunsen was right! I unplugged my batteries (both were put in the machine) and plugged the PRAM battery back, left it overnight, and the thing powers up without the battery being un…

With most lithium-ion packs, the fuel gauge software is adaptive. It needs a training period to get properly calibrated for a given set of cells. During that training period, the b…

It appears that Battery Reset is not compatible with Pismos unfortunately, but good try. I wish I could just figure out what causes the mAh number to go up and do it.

I have not tried that yet. I'll see what happens later tonight. I have been using Battery Health Monitor in Mac OS X to see the mAh values.

Have you tried Battery Reset?

I have a Pismo battery that went one day from holding a charge for an hour to not taking a charge, the light would not even blink on it. I took it apart and manually (eek!) charge…

Lucky, you got the cool iMac where it was user serviceable. Click to expand... Yup, mine's the same revision model. I was a bit bummed to find out only weeks after I purchased…

Some simple stuff you can try... When you run the disk repair and verification stuff within disk utilities while booted off the OS X install media, does it catch and repair anythi…

...So do I un solder the clamshell batteries to fit the pismo battery board or not. I'm afraid to do that because I do not want to screw something up so bad. Click to expand... …

Lucky, you got the cool iMac where it was user serviceable.

Complete specs: 1.8 Ghz PPC G5, 512 MB RAM, 80 gig HD. I've done nothing to it since buying it, except for the guy at the apple store who inserted the extra 256 stick of RAM. @ Qu…

If you leave it plugged in and off, with the main battery removed, and the motherboard battery plugged in, sometimes you can get a charge into the motherboard battery.

Holy Smokes it works! My gosh, I got it for a steal (literally...well not that I performed anything illegal) cuz it was not powering up. My goodness, thanks readers! Now it needs a…

Make sure that it's nothing to do with this: http://support.apple.com/kb/HT2390 I've already sent in my iMac G5 twice early this year and so far it's running OK. Mine wasn't eve…

I bet your HD is going... FAST... I would go get a replacement. If your iMac doesn't have an iSight it's easy to replace it. If it has an iSight, use my guide...

Some more info would be nice; complete specs, what you've done to it since/before it came slow, etc.

Also, it might be good to read the firewire section of http://support.apple.com/kb/HT1431 [] ]'>

Hey guys. Lately, my iMac has been painstakingly slowwwwwwww (at start up, with basic functions, and online. I guess it's lack of RAM, but I'm not so sure. What do you guys think i…

Find the PRAM battery cable, its on the right side under the keyboard right above the back of where the disk drive ends, its a red and white cable. Unplug the battery and try again…

Would a bad internal battery affect it from starting up? Also I plugged the battery in and it doesn't seem to be charging. I'm tempted to think it's a Power unit issue, just wonder…

try lifting the kbd up, and disconnecting the internal battery. the psu is compatible.

Folks on these forums are so helpful thought I'd get more help... I found a Pismo 500 (awesome, always wanted one) and I didn't have the Yo-yo adapter so I used my 1400c's power a…

Hacking lithium-ion battery packs is not for the uninitiated. Leave it alone. Click to expand... and how do you become initiated if you dont try ? Click to expand... Fra…

What's on the battery "board"? Click to expand... The "battery board" provides control systems for "intelligent batteries". The charging controls monitor voltage, current and t…

and how do you become initiated if you dont try ? Click to expand... I think he means "uninitiated" as "someone who has likely never messed with complex electronics before." I …