In addition, can you boot it into Open Firmware mode and tell me what version of ROM is running? IIRC, the last firmware update put it to version 4.1.8f5. I think that version may fix the sleep issues; reading the descriptions tells me the update improves overall stability and performance issues. Whilst in there, try also typing in the following incantations (minus quotes):

reset-nvram [Return]

set-defaults {Return]

reset-all [Return]

If the firmware is not up to 4.1.8f5, do a search for the update on Apple's support pages, reboot into OS 9 and install the update. To recall, Apple shut off software updates for anything earlier than OS X Tiger, so a manual search and install would be in order.

73s de Phreakout. :rambo: