View Full Version : G3 B/W 400, Freezing problem

08-26-2003, 11:26 AM
Recently purchased a used G3 400 and it intermittently freezes.

We have: Changed the hard drive; CD drive; changed and moved the RAM to diffent slots; changed the keyboard and mouse. Machine runs better but still freezes at random.

Upon checking the motherboard we noticed that the cover was missing over the clock speed jumpers. We feel this machine may be overclocked but we do not know what the default settings are.


08-26-2003, 11:46 AM
Hi Gatch,

So, is it actually running at 400? Check ASP or "About this Mac" to see, and verify against the specs on the tiny sticker on the back. Don't have jumper info handy, but I bet someone around here does. http://macgurus.com/infopop/emoticons/icon_smile.gif

What OS are you running?

Is it a Rev 1 or Rev 2? Does it have a sled that allows stacking 2 drives (Rev 2), or not (Rev 1)?

If you have a Rev 1, they have crappy ATA controllers that don't play nice with newer HDs; will corrupt data and crash, and eventually not even boot. plenty of good info about here (http://xlr8yourmac.com/G3-ZONE/yosemite/IDE/).

As far as memory goes, just to verify: Try pulling all but 1 stick, and then swapping out that 1 and testing again. Or better yet, consider running a utility like DIMM First Aid to actully test the memory. Did you supply it, or did it come in the G3?

Hang in there, if anybody can figure it out, the Gurus can.


Charlie Don't Surf!

08-26-2003, 01:10 PM
?I would have to say that the B&W is singularly unable to operate without very narrow hardware restrictions. The biggie is RAM. Download a copy of Dimm First Aid from www.download.com (http://www.download.com) and use it to make certain that all your ram is 8 nanosecond or better. 10 NS will not do.

?Following Unc's link to XLR8YourMac.com and determining your revision B&W will help us see where other factors like hard drives and host ATA controller might be negatively affecting your computer's stability.

?XLR8 also has a page on the jumpers on your motherboard. You DO want to absolutely be certain they are set properly. I believe that page is under 'overclocking the B&W', you'll have to run a search for it since I don't have a bookmark handy here.

?The B&W, with a little care, can be a very useful and reliable machine. We are using ours as the website development tool for this site. It still does a good job at that.


Quis Custodiet Custodes Ipsos?

08-26-2003, 03:41 PM
Don't forget after all this, to reset OpenFirmware. Can't hurt and should be done. I don't know the jumper settings but the G3*Zone on www.xlr8yourmac.com (http://www.xlr8yourmac.com) does.

8 ns RAM or faster. Best ot have ALL the RAM running at the same CAS latency (the B&W can't read the SPD value on RAM chips).

08-26-2003, 05:46 PM
I recently had the same problem, so you may want to check out everything I went through with my G3: http://www.macgurus.com/6/ubb.x?a=tpc&s=40160367&f=55360809&m=991603052

I finally solved the problem by replacing the CPU. It was, in fact, a bad CPU that was causing me all those problems. So you may want to pull the heatsink off and check the CPU. I never noticed it, and I may have actually done it myself, but I check the CPU a few days ago and there was a really tiny chip in the corner of the CPU.

Well, one 500 mhz Sonnett G3 later and I have not had a single crash. http://macgurus.com/infopop/emoticons/icon_biggrin.gif Woo-hoo!

So, if you have truly replaced everything and you have found jumpers (or a jumper block) for it, then take a close look at the CPU.

If you are looking for jumpers, they are hard to find. I only found them on ebay (and there is no "Buy it Now" option) and at this place: http://stn2.headgap.com/resale/FMPro?-db=OrdersC.fp3&-format=products.htm&-new

I haven't ordered from them, but at least they have them.


08-28-2003, 07:51 AM
http://macgurus.com/infopop/emoticons/icon_cool.gif Thanks for all your input. The machine is not locking up anymore. Hope it lasts!

08-29-2003, 04:49 AM
Gatch? Is that you? (From Now Recording?) Heh, it's me, the drummer. Anyway, HEAT is also a big culprit in freeze-ups. I have been playing around with a G3/Beige and found out the hard way about putting too much thermal compound on (it squeezes out under the plastic shim surrounding the core chip and can short out the other leads around it) More is not always better!

~Raster (aka rastrman)