As per the other e-mail, don't bother with OS 9 on such a slow PPC. Your best bet is to run OS 8.1, or, if you REALLY need 8.6 to run software install 8.6 (it may actually run a teeny bit faster than 8.1 and with greater stability but it comes with a RAM cost (24 MB minimum vs. 8 MB minimum used). BTW Your problems sound like they could be PRAM related. (even though I recently went on a tirade about the futility of resetting PRAM on another list) I will suggest you reset your PRAM. I think the command is command-option-P-R but I can't remember when to do it. A far more elegant & also free PRAM reset is TechTool Lite 3.0.2 (OS 9.2.2 support, requires OS 8.1) <http://www.micromat.com/> A second thought: you swapped in a "known good HD" but do you know whether or not the drivers on both HDs are "good" for a 7100/80? Have you tried reformatting the original drive with an OS 8.1 boot disk/CD & installing OS 8.1 drivers (I didn't get that impression from your first e-mail)? Depending on disk size (if it's over 1 GB) you'll want to make sure you format HFS+. Third thought: were you running OS 8.0 or 8.1? The ONLY OSes you should be running are 8.1, 8.6, 9.0.4, 9.1, 9.2.1, 9.2.2. You can run 8.5.1 if you have software that you need that breaks under 8.6 but it's not advised. The upgrades 8.0->8.1, 8.5->8.5.1/8.6, 9.0.x->9.0.4/9.1/9.2.1/9.2.2, 9.2.0->9.2.1/9.2.2 are all free downloads from Apple. 8.0, 8.5, 9.0, 9.0.1-9.0.3 are all NO GOs. They are the unstable bastard children that families like to commit to asylums (to avoid embarrassment when the Joneses come over). Eric. on 19/3/02 1:09, Alex at admeddemda@xxxxxx wrote: > slowing to a crawl, I _may_ be able to see, but erasing hard drives??? > > OS9 is compatible with a 7100 afaik, and I was installing just the > bAse ~50 meg system install (as opposed to the 200meg regular > install). > > I am still stumped abt the erased disks and such.... > >> You got it - the 7100 doesn't seem to be powewrful enough to run OS >> 9.0. Even if you're able to install it, we found that installing it >> on a 7100/80 causes the system to slow to a crawl. Out it came and >> everything ran smoothly again. >> >>> hi all-- >>> >>> just got a 7100/80 M/B and am having trouble. I had HUGE problems >>> installing OS 8 (many finder errors, forcing restart). Then finally >>> with OS 8 installed, I installed OS 9, and on restart i got an >>> extensions error. (actually bus error, and told me to restart with >>> extensions off). Then on restart the harddisk was unreadable! Users can subscribe to the List by sending an email to <muglo-request@xxxxxxxxxxxxx> with 'subscribe' in the Subject field Users can unsubscribe from the List by sending an email to <muglo-request@xxxxxxxxxxxxx> with 'unsubscribe' in the Subject field Users must send messages or replies to <muglo@xxxxxxxxxxxxx> All messages are archived so that you can view them at any time by going to <//www.freelists.org/archives/muglo> Problems concerning use of the FreeList should be sent to <paulthomas@xxxxxxx> Don't forget to periodically check our web site at: http://muglo.on.ca/