Good on ya Tom. I've heard previously that the G4's can have a problem with interlacing....I think RHB solved a similar problem that cropped up when he loaded his PTP with 8 x 128 Mb dimms (the piggy).
The reason for zapping from cold boot is to get at the area of pram that controls video settings. I understand that TechTool will also work from the finder. The caveat re the Sonnet cards was worth noting, so it's good of you to post your troubleshooting path. Cheers...Michael >Michael... > >Your suggestion (resetting the PRAM) eventually led me to the >solution (I've got my resolution back, and it's very nice!). However, >the pathway to achieving this was somewhat circuitous, so I thought >I'd post what happened, in case someone else runs into the same or >similar set of circumstances. > >When I first hit the Command-P-R upon reboot, there was an odd >pause...and then the only thing I saw was the disk icon with a >question mark. One thing I hadn't mentioned was that I have a Sonnet >G4 accelerator installed, and it needs the information in PRAM in >order to boot the machine. The manual says it's ok to reset PRAM when >you restart the machine from the Special menu, but NOT if you do it >on a cold boot. I'm not so sure based on what happened- but anyway, >the Crescendo comes with a floppy that will rewrite the PRAM, but >this didn't seem to help. The manual also suggests that if things >still aren't working, and if you have more than 100MB of memory >installed, you should try de-interlacing the memory (instead of >placing the memory boards in alternate banks (in pairs), place them >all right next to one another). After I did this, the computer booted >normally (weird, since it seemed to work fine like it was up to this >point). When I accessed the Monitors control panel, there was a whole >list of options for changing resolution and scan rate - 1024 x 768 at >100 Hz is very decent. So, although it's difficult to tell exactly >what caused what, it works now. Oh...it just so happens that the IMS >Twin Turbo cards have both an RGB port AND a VGA port - so I don't >even need the adapter. > >Regards, > >Tom > > >>Tom wrote: >> >>>I have a PTPro 225, and I recently purchased a used Apple 17" Studio >>>Display (CRT) monitor. The problem I have right now is that the only >>>resolution I have available to me is 640 x 480. The resolution with >>>my previous monitor was (I believe) 1024 x 768, with thousands of >>>colors. I have an adapter I'm using to convert the plug on the >>>monitor to what's required by the video card, and I'm wondering if >>>this could be the problem. Has anyone else used one of these monitors >>>with the PTPro? >> >>Does the adaptor have toggle switches.? >>If you had prior used a 15" monitor on the PTP, try Zapping the pram >>(command-option-P-R at startup (not restart) >>Also try Command-option-A-V at startup which should default the monitor >>back to factory settings. >> >> >>Cheers...Michael -- Power Computing is sponsored by <http://lowendmac.com/> and... 123Inkjets.com <http://lowendmac.com/ad/123inkjets.html> Support Low End Mac <http://lowendmac.com/lists/support.html> Power Computing list info: <http://lowendmac.com/power/list.html> 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://www.mail-archive.com/powercomputing%40mail.maclaunch.com/> Using a Macintosh? Get free email and more at Applelinks! <http://www.applelinks.com>
