1Welcome to the iMac CRT video/firmware problem pageDisclaimer: while the information here is presented in good faith, we takeno responsibility for er
10• disconnect power, remove memory and Airport cards, removebattery. Replace battery, PMU/CUDA reset, replace memory (onecard only, pr
11• Apple official memory specifications (NB higher memory capacitycan be achieved with modern memory cards)• Firmware compatibility listing fo
2Before going any further we suggest you print off this page and sit downwith a cuppa. Read, mark, learn, and inwardly digest. There is probablymore
3update; your precise symptoms (see below); and any other informationyou think may be relevant. Please give as much detail as you can.We want to hel
4S4. iMac turns itself off 7 – 10 seconds after power-on, even if thepower cord was pulled and replaced. You will probably hear thehard driv
5Firmware versionsThe latest versions are:1.2 for the early tray loading iMacs (233 – 333 MHz)4.1.9 for the slot loading iMacs4.1.9 can only
6For tray loaders just use the link above to version 1.2 firmware(does the firmware fix problems for tray loaders or only slotloa
7mac or you might be able to connect another compatible HD). Makesure the firmware updater is fully unpacked and ready to rock androll.After the iMac
8b) Leave it switched off with the power cord disconnected for 24hrs (leave the power cord in at first for 10 mins is thisenough?. This s
9Finally I restored the video cable and power and the iMacbooted up smoothly. (Another user merely had to unplug andrestore the video cab
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