By my experiences with different kinds of computers, these system errors can be due to a bad RAM, processor or motherboard (most times it's the RAM). I'd try to replace *all* memory modules with known-good ones, and see if that helps.
Other thing to watch for is the tensions power supply is providing - which, at least in the older compact Macs, can sometimes cause system errors. I can't tell you how to measure it because I don't know the 5200, but you should make sure that the three main supplies (+12 V., +5 V. and +3.3 V) are within 5% of their stated value (for example, from +11.5 to +12.5 V. for the +12 V. line). If they aren't, you should adjust the 5200's power supply. Btw: maybe the System 9 CD boots without problem because it uses a minimum install of System 9 to boot from, or even a modified System 8.x copy. If it's the memory thing (which I think is the most probable option), it would explain easily why it crashes sometimes and doesn't in ither conditions: loading an OS setup with an smaller footprint would use less memory and reduce the chances of hitting a corrupted memory address. Greetings, Antonio Rodr�guez (Grijan) <ftp://grijan.cjb.net:21000/> MaUsE ha escrito: > Hi All, > > I am attempting to help a member of our Mac User Group with an issue he > has with his PPC 5200CD. I am stumped but hoping that I am missing the > forest for the trees, so to speak. > > The problem is that this machine refuses to boot up in OS 9.0 unless > one holds the Shift key down to turn off all Extensions. If one fails > to do this, one gets a "Bus Error" or "Illegal Instruction" bomb on > boot up. > > [...] > > Jim Foster > President > Macintosh Users East [MaUsE] > http://www.mause.ca -- 1st-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> 1st PowerMacs list info: <http://lowendmac.com/lists/1st-powermacs.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]> List archive: <http://mail.maclaunch.com/lists/1st-powermacs/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
