PCI slots do not work (FIXED!)

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dhlord64
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I have yet another issue but this one relates to another thread I made back in February. See it for more details.

So I put in an EVGA 250 GTS in late January. Ever since then my PCI slots have acted strange. The wireless LAN card that was in there worked for several months since I built this computer last July. It would freeze my computer. I took it out and put in a different one. It worked and did not freeze my computer but eventually it would stop working and it would not be detected by my computer at all. I tested both out on a different PC and they worked perfectly. I tried a new PSU and that didn't fix anything at all. So I decided to just by a wireless LAN USB adapter.

Fast forward to today and the problem has come back to haunt me. I put a new sound card in and it recognizes it for a second then it stops recognizing it completely. I tried both PCI slots and still nothing. These are the exact same symptoms with one of the wireless LAN cards. So I am beyond baffled. I am currently talking back and forth with MSI and so far what he insisted hasn't worked. I assume this is an IRQ resource issue yet I see no IRQ conflict in device manager. I tried clearing the CMOS and it still didn't work. Help would be much appreciated.

MOBO: 790xt-g45 (latest BIOS update 2.5)
Sound card: ASUS Xonar DG
GPU: EVGA 250 GTS
CPU: AMD Phenom II X4 B50

eire1274
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Well, the PCI slots on that board are hosted by a single PCI-e 1x extension (virtual slot), so my best guess is that you are getting interference on the chip that hosts it, which if I am reading the circuit map correctly is right behind the first (top or closest to the CPU socket) PCI-e 16x slot. Typically EVGA doesn't do weird stuff with their board designs, but the GTS GTX series GPUs were always hot buggers... I wonder if it is the cause of your issue, possibly producing a magnetic/RF signal...?

Does the issue happen if you move the video card to the lower slot (assuming it is a dual slot design, otherwise it will block both PCI slots)? Also, you may want to try another video card and see if the issue stops.

Oh, yeah, in the BIOS, look at your "PCI Latency Timer" setting, and set it higher and see if that changes anything. A short PCI cycle can confuse aggressive devices as they can lose the PCI bus access before they are ready.

Nick McDermott - 3dGM Admin

dhlord64
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Very interesting....

I have noticed interference through my speakers ever since that GPU was put in (I think). It would happen a lot. It hasn't happened much at all the past month or so. I moved the speaker wires and it would stop.

I did try moving the GPU down but I got the same results. I did try my old GPU back in January or February and I don't quite remember the results.

I will try all of what you said. Hopefully it's the GPU because I want to replace that anyway. Anything but the damn motherboard.

dhlord64
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I tried a 9800 GT in there and the sound card still didn't work.....

EDIT: After some more research...could it be that the mobo pins are touching the case or the screws are too tight and causing the pci slots to not work correctly. This also may relate to voltage fluctuation I was having in my last thread. I notice it happens when I mess with the components. Sometimes the voltages are perfect, and sometimes they are fluctuating. The mobo is not grounded correctly it seems. I should take out the mobo and put it back in and see what happens.

Tivon
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Motherboard problems can be the worst. If you have already done the bios updates. I guess you can try pulling everything out of the case and run it all external for testing. Odds are if the motherboard is having issues like this then you should either RMA it or replace it with something else.

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eire1274
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It is really sounding like permanent damage has occurred to the PCI bus controller. Otherwise the mobo is operating fine?

Nick McDermott - 3dGM Admin

dhlord64
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I believe I have fixed the problem. I took the motherboard out and put it back in and the sound card has worked ever since! Some of the screws were loose at the bottom so the mobo was not evenly tightened down.

eire1274
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Huh, good news! This is why I always tell people to mount EVERY SPOT on their boards and not miss any. Most modern boards have unified ground, so theoretically, if one spot grounds the whole board grounds, but it looks like in your case somebody missed a circuit bridge on the board design!

Glad it is working!

Nick McDermott - 3dGM Admin

dhlord64
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Hmmm. It seems the problem may not be completely solved. The card worked well for a few days, but then yesterday my PC froze in game. I didn't think much of it but then it happened twice today in game. Then when I rebooted the computer the sound card stopped working :(

It has showed the same signs of both of what my network cards were doing back in February. One would freeze the computer and the other would stop working after a few minutes. So I did what I did previously to fix this problem and I noticed that some of the mobo screws were wrong. They were a little shorter and had ridges on the bottom. They were not flat on the bottom of the screw head so they were not flush with the mobo. Could this be a problem? I even notice that some of the pins that the screws go in to were loose. One wasn't even screwed in to the case as it was with the screw it self. The sound card is working again currently. I will never know if this thing will ever be completely stable. This is driving me nuts....PCI slots, Hyper Transport Sync Flood Error...what the hell could be next?

Tivon
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Hyper Transport Sync Flood Error... Could be voltages or maybe try other Bios versions.

dhlord64
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The HTSF Error has a thread of it's own. Someone pin pointed it to the North Bridge overheating. The voltages are all very steady and where they should be. I can't get a fan positioned to blow cool air on to it though.

eire1274
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First off, yeah, take that board out, get a wrench, and tighten ALL of those spacers in TIGHT.

Second, use screws with a flat underside of the head, not the ridged ones. The ridged bits are for case mounting PSUs and expansion cards and such, and will actually break up the conductive surfaces on mobos. Tighten these up well, too. If you wish, you can use a drop of dielectric grease at each screw, but I DO NOT RECOMMEND using it on the spacer mounting as it can provide lubrication and allow rotation via vibration. NO NOT USE LOCTITE or other locking compounds as the can badly reduce conduction.

Nick McDermott - 3dGM Admin

dhlord64
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It's been working perfectly ever since I put the right screws in! Still getting that dreaded HTSF error but it doesn't happen too often.