First, my g5 isight suddenly won't go into osx, it just turned on (the indicator on the right flashed but without sound like it normally does), and displayed that processing wheel for minutes (i waited for as long as 40 minutes). i unplugged it and when i plugged it back in it won't power up, no anything.
1) remove all external , leaving only keyboard anf mouse. 2) turn power on and press and leave mouse depress until any cd are out from cd bay Main boadr is ok but system canot be loaded due to a corrupted os x load
if u have original cd please insert
1) remove power cord to De-enegize system 2) plug power cord back and press power buttom insert Mac Osx Labeled Install CD ,Press Comand-C to boot from CD
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Best thing you can do is to determine whether its the port or the camera.
If you go to the Apple in the upper-left corner, and go to "About this Mac", then click "More information", it will start System Profiler. On the left side, under "Hardware", click on "Firewire" and see if your iSight shows up. If you have another FireWire device, plug it in, and see if it shows up there as well. The solution could just be a dead iSight (hopefully!). The worst case scenario is a dead FireWire bus...
If you have a dead iSight, I'd guess that ebay would be your best resource at this point. If its a dead bus, I'm afraid it won't be terribly cost effective to fix it :-/
If your cover is off the Mac tower, it won't start, but the fans run really fast and the red light comes on. The plastic cover needs to be in place so that air flows the way apple wants to avoid overheating. The metal cover may also need to be in place as well.
You need a mic input. I did a slick voice-over on my G5 by using the mic in the iSight camera. It's a very good quality voice mic. If you don't have that, purchase iMic from a local computer apple store. This will allow you to hook up a mini stereo plugged mic to your computer with a USB connection and you can record from within Imovie and also from the system preference control for sound input. Then copy the sound file onto a CD as an mp3..
I understand from your problem statement that the internal iSight camera in your G5 iMac turns itself off around 10 seconds after you turn it on.
Create a new temporary user in System Preferences / Accounts. Log out and then log in as this user. Enable the camera. Does it still turn off in 10 seconds? If not, something running in your other user account (a startup program or system preference) is interfering with the operation of your camera.
If you have a spare external drive, install a fresh version of the Mac OS on that drive, then boot from that drive. Does the camera still turn off in 10 seconds? If not, you should run an OS installation with "archive and install" on your internal drive. If it does, you have a hardware problem that requires a Mac tech. If this is indeed a G5 iMac, the repair will likely not be cost-effective.
It is possible to install the OS from an image that's been generated on an external HDD as well, but you can't install the OS from a disk image that you're running within the OS. If you lost your installation disc, you can get a replacement by calling Apple.