How many screws are supposed to be install in a G4 Quicksilver 1GHz DP CPU?

Question

Hi.
I got a new (used, lol) Quicksilver 1GHz DP which is having problems "using" the first RAM bank (DIMM 0/J21 - closest to the processor). When I first got the machine (in the mail, well protected), I did a quick internal inspection, making sure that everything was properly seated - it had two pieces of RAM (512MB each) installed in slots DIMM 1/J22 & DIMM 1/J23. I closed it and started up from the Apple Hardware Test CD for the QS 2002 and everything tested fine. It had no OS, so I booted it up, installed Tiger and then used it for a couple of hours making sure everything was okay. Now, I thought when I'd first opened it, that I'd added a third piece of 512MB into the empty first slot before doing the installation and such, but now I can't remember for sure. The piece I would have added would have been tested and true from my other Quicksilver 867MHz (but on a QS 2002 motherboard).
My plan was to clean the QS 1GHz DP machine out, re-seating the dual processor cpu with fresh thermal paste, replace the fans in it, then move everything (ie drives, video card, pci cards, etc) from my older QS into the new machine, after I'd made sure everything mechanically was running okay. So I basically completely took the "new" QS apart, cleaning out dust, etc including the Motherboard - took out the power supply and case fan cage, replacing the fans there, cleaned and re-seated the cpu using Diamond thermal paste - then put everything back together. I put back in the original drive I'd just installed Tiger onto and original video card, but with two pieces of the RAM (Hynix 512mb) that I'd been using in my other QS, and one of the pieces that was already in the machine (Micron 513mb). I reset the CUDA button, then booted it up and it started up fine, I fiddled around for a bit, opening things, then put it sleep for about twenty minutes (to test that also). When I came back and tried to wake it up, the monitor woke up as in, the power light on it turned green for a moment, then it went back to amber, with nothing on the screen. The power light on the QS was green and the fans were running - so after a bit I held down the power light to shut it down, opened it and rechecked the video card, etc to make sure everything was plugged in okay - then tried to power it up, zapping the PRAM - the start-up sound bonged four times, then when I released the keys, the power light went out and it shut down. I tried again starting it up and this I got 2 beeps & flashing lights, which I looked up on my laptop and it said "incompatible RAM". So I removed the piece that came with it which just happened to be in the first DIMM 0/J21 slot (the other two pieces I've been using with no problem for over a year), . Started up the machine and it started fine - no problems. Then I shut it down and installed the 3rd (tested & true) piece I've been using in the other QS - it started up and mounted to the desktop, so I ran some software, put it to sleep, etc. Thought I'd figured out the problem, and continued with the transfer of drives, etc. Started up the machine and the red light on the motherboard turn red, fans powered up, it sounded the "bong", then shut itself off. I took the piece of RAM out, put it back in and it'd start up fine, but after a short period of time, it would freeze or shut itself off. I then went off on an extensive period of testing everything piece by piece (short of removing the cpu and the motherboard again) but couldn't find anything I'd done wrong - even thought it was because I hadn't used the 2-pin internal power connector in the power supply, so I removed the PSU again, and hooked it up to the other Quicksilver and had no problems. I even re-ran the Hardware Test (with the bank empty) and got no errors.
What I have noticed is that it'd be okay for a period of time AFTER I'd re-seat RAM in the first bank (pressing it firmly back in) - and then when it'd shut itself off, I'd opened the side door and it'd turn itself on again - I'd move the door a little lower, it'd turn itself off - then as I moved the side door again, back on - as if there was a connection problem. I inspected that bank up close with a magnifying glass and can't find anything physically wrong with it - no pins out of place, or dirt. I don't think I misplaced any screws for the CPU, but when I was done, I did notice that there is a fifth hole on the dual processor board on the extreme right that aligns right above a motherboard screw (when facing the opened computer with the back ports on the far side from you) - and I had only 4 CPU screws at the end. So I'm wondering if there should be a support post and screw between the CPU and the Motherboard, giving "ground" to the fifth copper-ringed hole on the CPU - the lack of which which might be affecting the first RAM bank?? Below is a link to a picture of the dual processor card. I've looked around the internet but can't find a clear picture or indication of whether I've missed a cpu screw or not.
http://www.welovemacs.com/6612591r.html
I thought, before I took everything apart again, including the Motherboard and CPU, I'd find out if aa I needed was to add a support and screw to that fifth hole (which I do have access to) - if that would fix the problem. Or if that fifth screw is not needed, can you suggest something else I've missed - the fact that the machine turns itself on and off as I move the door is pretty weird. It's not the first time I've replaced a motherboard or cpu and I'm pretty careful and thorough, but... Sorry for the length of this and thanks greatly for your help.
Karbon
Note: After a lot of reading and research, I decided upon Noctua fans for the case and power supply, hooked up via adapters to the Molex power connectors, not to the original 2-pin connectors, as I found I got a much higher cfm airflow that way. Also, other than the shutting itself off, I've had no software problems such as kernal panics or such at all. I've been using it for the past couple of days with the first RAM bank with no problems at all - posting this on it now.

Answer 1

Thanks Jon for your response - at least I know I didn't misplace any parts while putting back together. I'm probably going to strip it down again though, it just doesn't make sense. I agree that they can be temperamental but my other QS which only has a 867mhz processor I put into a 2002 motherboard (the old board had issues, so I replaced it with the newer version) has really given no problems since I first assembled it all together almost 2 years ago. And although I haven't completely taken it apart again, I have used it to troubleshoot various pieces of RAM, video cards, etc without any problems. Yes, it's picky about what PCI card goes where, but would just having a different processor on a similar motherboard cause such a glitche? And actually the only glitche has been this RAM bank thing - which does come and go when I move the door, so I must have missed something else when assembling it.
After reading through a number of other posts, I shut down and did another PMU reset with a piece of known good RAM in the bank - but to no avail - it still sounded the bong as if it was going to start, then shut down. So I unplugged it and carefully copper-brushed out the bank and blew it out, then started up with a piece of RAM in the dissenting bank (but none in the middle bank), into Open Firmware doing a NVRAM reset according to the Apple document. I booted into the drive running Leopard, put it to sleep without any waking freeze, then rebooted into the Tiger hard drive which I normally prefer to work from (I don't really see the hype about Leopard - I don't find any benefits from using it - I find it picky and next to impossible to search files with, without a big drama and extra work). Anyway, that's where I am now - typing this - so far, so good, but it's worked okay for a short time before after re-seating the RAM in that bank - a sleep and a reboot will be the defining moment.
Thanks again.