On Saturday, December 14, 2002, at 01:37 AM, Dan Dumas wrote: > I believe this post was sent to me directly. I will cc the list as I > don't > have a solution for this person (or for myself). > > >> I saw you had exactly the same problem as I have now. I hope you'll >> understand. >> I've an old iMac, running OS 9, it said I had to update the iMac >> Firmware, >> after update the Firmware, it doens't boot anymore. Exactly the same >> problem you had a while ago. Did you found any solution? > > I've found this firmware update catastrophe on the Internet in a few > places > and there doesn't seem to be a solution -- other than a repair shop. I > suspect you need a new logic board.
the conventional wisdom on issues like this is that your logic board was already toast, and the firmware update triggered the actual failure. Here's how a firmware update works... there's a rewritable EEPROM on the logic board that holds the Boot ROM (aka Firmware). The firmware update erases that chip, then writes the new Boot ROM into it. EEPROMs, unfortunately, can only be erased and re-written a set number of times (usually somewhere between a few dozen times to a few hundred, depending on type). If the 'erase' mechanism of the EEPROM is damaged, it can fry the EEPROM when the firmware update sends the 'erase' message. If the 'write' mechanism is damaged, you get an erased EEPROM that doesn't have (and can't have) any Boot ROM. If the EEPROM has simply used up its share of 'writes', you get the same affect... an empty EEPROM and no boot. -- The iMac List is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | - Epson Stylus Color 580 Printers - new at $69 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> iMac List info: <http://lowendmac.com/imac/list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/imac-list%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
