840av.... no video signal

[vassilizaitsev]

I just got anohter 840av...

I bought it as is, so there's no drama.

I plugged it in and it chimes.

The cd starts spinning.

There is a floppy disk in the drive, but nothing happens.

I don't seem to be able to get a video signal

I'm leaving it on a while to see if it'll suddenly wake up.

It came without memory or pram battery, but I can swap these into it... would these prevent it from starting up? The pram would only do the date... but the memory... I need some in? Ok I'd better go & get busy with that...

What is the thing to do... if we want to use the tv as a display?

I'll report back later...

 

[joshc]

Any computer needs memory to successfully boot and give video out... You don't need a PRAM battery however.

 

[vassilizaitsev]

Yeah, that's what I figured.... just some mace have memory soldered already on the board.

So I put the memory & pram battery in, attatched two hard drives, floppy drive and cd rom.

I got a happy mac

I set some things... resolution, date, switched off and back on without the cd in the drive... cd in drive is/was os 8.0 install disk.

The computer wouldn't start... got the chime, but it didn't seem interested in the floppy Apple os 7.1 I had in, nor in the hard drives... so 20 mins later, a bit of hard drive swapping... but at the moment..it doesn't want to start... no power, no chime!

I'm gonna give it a little breather, and then try again.

 

[joshc]

FYI, the 840AV needs the System Enabler 088 v1.0 to use System 7.1.

 

[vassilizaitsev]

Wahey

840av appears to be up & running with my 4.23 gig hard drive and a 500Meg hard drive... had to swap the jumpers on the 500 meg hard drive to get it to work.

What is the best thing so far? I have found MacZilla on my 500Meg hard drive! yes I miss that program.

I now have 3 fascia's if anyone's interested... you know the bits that go over the cd, the floppy drive & one that covers the space where a hard drive sits... they're all in good condition, only the third, blanking fascia, one of the three little plastic side hooks snapped off, but if anyone is interested in such things, postage in UK or europe is no problem.

I have a cd caddy cd rom drive, with two caddy's... if anyone is interested let me know.

I need to get myself two 32Mb sticks of memory, to take me up to the 128Mb mark.

& right now I'm babysitting my son, so I still have to figure out where I'm going to let the 840av live...

 

[beachycove]

I have had these symptoms with an 840av: booting occasionally and seemingly working fine when it worked, but mostly not getting past initial powering on, with no chime and no video. That must have started with my 840av about 6 years ago.

At the time, by a stroke of luck I was able to replace the logic board in my 840av with another that I acquired as new service part, believe it or not, from a local ex-dealer, as part of a lot of parts. It worked for 4-5 years, but I then started to get the same symptoms that I had with the older board.

I finally got around to taking a closer look late last year and discovered capacitor failure on both logic boards. In one case, the goo had actually gotten in around the main power connector lines.

A cycle in the dishwasher solved that little problem for a while. Eventually, of course, I'll need to replace the defective parts.

Your trouble may have been drive jumpers, but mine were definitely more deep-seated. I have also just had a Q650 fail, and suspect the caps once again. I guess the time has come to start fussing over capacitors in Quadras in the way we have already learned to do in connection with SE/30s.