Apple iMac G5, 20-inch - Manual (Page 281)

iMac G5, 20-inch Troubleshooting - 57 Error Beep(s) Symptom Charts
Error Beep(s)
Computer beeps at startup.
1. Check that the memory DIMMs are iMac G5 compliant. iMac G5 computers work with
memory modules (DIMMs) that meet all of these criteria: PC3200, 2.5V, unbuffered, 8-
byte, nonparity, 184-pin, 400Mhz DDR SDRAM.
There are two RAM slots. The maximum amount of RAM you can install is 2 GB. You
can use RAM module sizes of 256 MB, 512 MB and 1 GB, in either slot.
DIMMs with any of the following features are not supported in the iMac G5 computer:
registers or buffers, PLLs, ECC, parity, or EDO RAM.
2. Reseat the memory into the slot.
3. Replace the memory.
4. Replace the logic board.
USB
A USB device doesn’t work
1. Please unplug all of your USB devices from your iMac except your Apple Keyboard
and Apple mouse.
2. Now plug your device directly into the back of your iMac. Does it work as expected
now?
Yes: Your device works when plugged directly into the computer. This indicates a
conflict with one of the other USB devices. You can test by gradually adding your
devices back and seeing where the issue occurs, then contacting the manufacturer of
the device(s) for assistance.
No: Unplug your device from the iMac and plug the keyboard into the port your
device just occupied. Is your keyboard still working?
– Yes: Your Apple Keyboard works when plugged into the USB port your device was
plugged into. This points to an issue with your device. Please review the
documentation that came with your device. Install any necessary drivers and
contact the manufacturer of your device for assistance.
– No: Replace the logic board
I see a message saying not enough power to function.
It appears that this device needs to be plugged into the computer's USB port, rather than
the keyboard USB port. Any USB device connected to the keyboard needs to be either a
self-powered device (a USB device with its own AC power supply), or a low-power device
(a device that does not need a large amount of voltage to operate). Your device may draw
more power than the keyboard can provide.