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Old 29th November 2012, 05:14 AM   #1
wwenze is offline wwenze  Singapore
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Default Anyone skilled in computer boot up process?

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My system, without a case, does not have any screw to hold the expansion cards in place, so naturally the cards suffer from bad connection.

But the graphics card has a strange behavior. I need to slightly hold the graphics card upright when I cold/warm boot the system, after I see the POST screen I can let go the gfx card and it will work properly, for hours of non-stop gaming. But if I do a reset, it will still fail to boot.

What explanation is there for this behavior?

PRSNT pins are measured to be shorted with the card in both positions.

The card leans away from the CPU when not supported by the piece of plastic which I am using to fix the problem.

(I'm not interested in the solutions, because I already have a solution; I want to find out why the system behaves that way.)
Which PCI-E pins are needed only during bootup?

Last edited by wwenze; 29th November 2012 at 05:53 AM.
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Old 29th November 2012, 05:27 AM   #2
PDL is offline PDL  United States
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Either buy a case or salvage an old one... sounds like this would solve your problem.
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Old 29th November 2012, 12:41 PM   #3
freax is offline freax  Australia
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dude, expansion cards NEED THOSE SCREWS TO WORK!

You can't just support a card entirely on the pci-x x16 socket! get some screws for the case and that will fix your problem, it needs all of those pins, it can't just run on a whole half of a socket.

imagine if someone got a scalpel and cut away half of the nerves that connect your spinal cord to your brain nobody would work that well like that either, the pci-e x16 socket is like a spinal cord to the graphics card.

the reason why its doing it is because the pci socket has 2 rows of pins and when the gfx card is pulling down on the PCB board of the gfx card it only allows contact to one side of these pins which are located inside of the pci socket, most likely the bottom row of pins aren't getting sufficient contact inorder for it to work properly.

when you have the screws mounting the graphcs card higher up to the chassis, it makes a perfect contact surface with BOTH rows of pins that are located inside of the pci socket, in essence taking the huge strain off of the pci socket.

failure to do this in a situation like for example where your computer is falling off of the table WILL result in the graphics card ripping the entire pci-e socket off of the motherboard once it lands on the floor, as the entire weight of the graphics card is exerted upon the pci-e slot on the motherboard, rendering it useless without replacing the motherboard.
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Last edited by freax; 29th November 2012 at 12:52 PM.
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Old 29th November 2012, 01:19 PM   #4
PDL is offline PDL  United States
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He stated he's not using a case...
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Old 29th November 2012, 01:34 PM   #5
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Old 29th November 2012, 02:38 PM   #6
wwenze is offline wwenze  Singapore
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Nobody knows why? Aside from, quote myself, "so naturally the cards suffer from bad connection" - which does not sufficiently satisfy my wonder of why it only fails at boot and not during actual load.

Last edited by wwenze; 29th November 2012 at 02:40 PM.
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Old 2nd December 2012, 01:26 PM   #7
freax is offline freax  Australia
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This is a diyaudio site, ontop of that to answer that question it would require an engineer trained in those fields of which there is never going to be one on this site.

You won't get an answer.
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Old 2nd December 2012, 01:31 PM   #8
Face is offline Face  United States
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Try Overclock.net
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Old 9th December 2012, 08:00 PM   #9
tvrgeek is offline tvrgeek  United States
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No case means you are in SEVERE violation of any countries EMI radiation laws. I suspect you just have a card seating issue. The connectors are not designed to hold the card up. Get a case.

Which pins are used on boot will depend completely on the card and driver. THere is no blanket easy answer.

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Old 9th December 2012, 08:13 PM   #10
ruerose is offline ruerose  Canada
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As mentioned, its probably poor grounding (case) or poor connection to the PCI-e slot due to no support.

As far as EMI, I really think that's a red herring. Every individual component must adhere to EMI laws, whether or not it has a case:

(not my pic, but I own the same case for my home rig)
Click the image to open in full size.
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