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The fans all work fine. I have very little experience working with electronics, and I don't have a voltmeter or anything with me right now, so I've gone ahead and ordered a replacement power supply and logic board. If that doesn't fix the issue, I don't know what will. Even if one of the parts...

Thanks for all the tips, everyone. I'm not too experienced with hardware troubleshooting, but I'll do what I can and ask about what I can't figure out. If this information is useful, I haven't made any changes to the system's hardware configuration since I got it (in May), so I can't think of...

I just opened it up and looked around. Everything looked clean and normal as far as I could tell. I reseated all the RAM cards, reset the logic board according to the service manual's instructions, and put it back together with no improvement. What should my next move be from here?

I posted this to the Vintage Macs e-mail list too, but I'm trying to find help wherever I can. This has really got me worried because if I need a new motherboard or something, I have no idea where to get one. I've been having a serious problem with my Quadra 840AV lately. It's been working fine...

Another big advantage of Open Transport is being able to access file servers running OS X 10.4 (using OS 7.6 and AppleShare 3.8.3). My primary Mac is a G4 running 10.4.10 (as noted, 68Ks can only do certain things in today's world) and not being able to properly share files between the two...

I was running QuickTime 4 on my Quadra 840AV (7.6.1), but I recently re-installed the OS and left it at QuickTime 2.5 for the time being. I have a suspicion the newer QuickTime version was impacting performance (not exactly sure though), so my plan for now is to leave it at 2.5 unless something...

For some reason I've never been able to get online using MacTCP.

My 840AV can handle many sites capably, but it chokes on fancy stuff like eBay, etc. At the very least, it's decent for reading news and such.