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About reiddick

  • Birthday 07/19/1952

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    Kent, UK
  1. I did try setting up a basic machine some time ago with the same result. I have two power supplies as I though that might be the problem earlier. I checked and cleaned the original one and it looked in good condition but I still got the same result from both of them. I think the fact that the "new" board that I recently acquired works fine must mean that the problem lies with my old board. I've ordered some new thermal paste and I'll try the old one again with the RAM from the "new" board as I know this is working. If that fails then I think I out of options.
  2. Just thought I'd send an update to my situation with the Quadra 840AV. I decided to order some new tantalum caps and do the recapping again. The recapping went well and I reassembled the Quadra and turned it on. It chimed and booted up first time. It remained on and working for about ten minutes and I thought I'd cracked the problem. It then just stopped working just as before, screen went black although the fan and hard drive were still spinning. So I was back to square one. I thought that I'd gone far enough with it and decided to pack it up into the loft for now and probably see if
  3. Hi, As an update to my situation, I removed the RAM, ROM, heatsink and battery from the Q 840AV and cleaned the board again using alcohol and then put it into the washing machine. It came out looking very clean so I let it thoroughly dry out for a few days and reassembled it with a new battery for good measure. When I powered it on, there was a chime, a short pause and the monitor fired up to the desktop. Excellent I thought and just watched it to see what happened. Sadly, after a couple of minutes, the screen went black and although the HD and power supply fan were still spinning, the
  4. Thanks, I'll give it a try over the weekend and I wont forget the thermal paste.
  5. I think another clean would be a good idea as there may be residue under the new caps that got missed in the last clean. I'll try an alcohol wash with a brush that can get under the new caps followed by a dishwasher clean without soap. Would you leave the RAM on the board for cleaning and would you remove the hearsink? Thanks again.
  6. Yes, I did clean it several times. It had a wash with water and I've been over it with Isopropial alcohol also. I agree they look bad but it was like that when it was booting well I think.
  7. Thanks for the speedy reply. I've attached (hopefully) 3 pictures of the "bad" bits. I did come across this in another thread: As soon as the Mac is turned on, it runs a diagnostic test stored in ROM (Read Only Memory). Part of the Macintosh Operating System is in ROM as well. This part of the Operating System is now software in iMacs and G3s.It made me wonder if the ROM in mine is faulty that this could be the cause of my problems.
  8. Hi I'm looking for help please with my Quadra 840AV that I've owned since approx 1996. I used this superb computer for my audio editing business, after upgrading from a IICi, for several years until I eventually acquired a 7100. I removed the Digidesign audio cards and used it as an office machine after that before eventually moving it to the loft for storage. A couple of years ago I got it out to see what condition it was in then. I set it up and powered it on to find that there was no chime but it did power on and the drives spun. There was no video output. So I took it apart
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