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Mac Forum / General / Hardware / February 2007iMac USB problems
I just bought an older iMac from a thrift store and it was working when I bought it. It booted up once but one of the two USB ports is broken and the other isn't working because I can't get a response when I plug in a keyboard or mouse. I was wondering if the USB ports are easily replaceable. I can't figure out how to open up the case. Also, I was wondering if I can somehow use one of the firewire ports to use the keyboard. I don't want to spend a lot of money on this. I noticed when it first booted up, I smelled something burning on the keyboard. I hope something isn't burned up inside. It'll boot up but cannot get any mouse movement to do anything. > I just bought an older iMac from a thrift store and it was working when I > bought it. It booted up once but one of the two USB ports is broken and the > other isn't working because I can't get a response when I plug in a keyboard > or mouse. I was wondering if the USB ports are easily replaceable. Not really. Not without a soldering gun and some self-confidence. And that's assuming it's specifically the ports rather than any other part off the USB subsystem. > I can't figure out how to open up the case. Depends on the vintage of iMac. If you're talking about one of the G3-based melted gumdrops, there are screws on the underside under a panel or two (depending on the specific model). Once you get them out the rear of the case bottom lift away easily, but the front is kind of latched on so you'll have to be careful popping it out. G  SignatureThe best intentions in the world don't make a flawed argument magically valid. > I just bought an older iMac from a thrift store and it was working when I > bought it. It booted up once but one of the two USB ports is broken and the [quoted text clipped - 5 lines] > something burning on the keyboard. I hope something isn't burned up inside. > It'll boot up but cannot get any mouse movement to do anything. Would suggest that the first thing to do, which you may have done already, is to run System Profiler and see what it says about the state of the USB bus and hub(s). This may not reveal anything useful, but then again it may. If it reveals one or more hubs inoperative, there's a good chance this is a software/firmware problem. If it reports everything operating properly, then the problem is more likely to be hardware, but this is not certain. If no port is reported, it could be because nothing is plugged into it. I can't really give you more details since I don't know what generation iMac you have or what operating system you are using. System Profiler has changed quite significantly over time. Just click around, you may be surprised what it can tell you. I have a second generation iMac G5 running MacOS X 10.4 and have just discovered there is a lot more USB stuffed into it than I was aware. The built in iSight and IR receiver are on what must be an internal high speed USB bus. There is also some sort of Teac device listed, but the only Teac I am aware of owning is a cassette deck connected to my stereo in the other room. Go figure. > In article <za-dnVpB-_9CZ0vYnZ2dnUVZ_hSdn...@comcast.com>, > [quoted text clipped - 7 lines] > > something burning on the keyboard. I hope something isn't burned up inside. > > It'll boot up but cannot get any mouse movement to do anything. It would probably be easiest to replace the entire logic board. The PAVs in these are what usually burn out so there's a lot of good logic boards and down converters out there for cheap. Richard I wish I could run the system profiler, but with no ability to move the cursor, there's little I can do. I have the older G3 with the slot loading CD. I burned up a second keyboard and don't want to ruin any more. I can see from the outside that one of the USB ports is damaged. I'm running OS 9.1. >> I just bought an older iMac from a thrift store and it was working when I >> bought it. It booted up once but one of the two USB ports is broken and [quoted text clipped - 30 lines] > sort of Teac device listed, but the only Teac I am aware of owning is a > cassette deck connected to my stereo in the other room. Go figure. |
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