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Motherboard blues
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 Re: Motherboard blues
Posted by Andrei on Sat Jan 1st at 8:15pm 2005

Something weird is going on with my comp. After a sudden crash, i found that my computer refuses to boot up any of my 2 operating systems, preferring to display a 15miliseconds blue screen and then reset. After inspecting my machines guts, i found that non of my hardware is damaged except for one thing: the JCLK jumper, which is simply melted off!For those who don't know, the JCLK is the CPU FSB Select jumper (selects the front side bus of the CPU installed on the mainboard). Can this cable be bought seperately? Or is this not the problem?

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After googling around for 30 minutes i found several ppl, very fond of overclocking, stating that they removed this jumper in order to improve their CPU performance. If the comp runs without it, then...what could the problem be?!

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 Re: Motherboard blues
Posted by Gorbachev on Sat Jan 1st at 11:43pm 2005

A jumper should easily be able to be replaced. If you remove the jumper it's a setting of "open" on both of the possible circuits (presuming there are 3 pins and one 2-pin jumper.) It might just have a default for the motherboard to accept all FSBs if the circuits are open, but it also might be the cause of the issue. Try getting a jumper from somewhere (they're all the same, HDD, Motherboard, etc.) I bet even wrapping tinfoil around it would work (but not recommended )
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 Re: Motherboard blues
Posted by Crono on Sun Jan 2nd at 12:05am 2005

I think a larger issue is: It got hot enough to MELT the jumper.
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 Re: Motherboard blues
Posted by Wild Card on Sun Jan 2nd at 1:06am 2005

Yea, me wonders how that could fuse like that. Then again, could have simply been a spark. Which is what Im thinking.

One thing that had me scratching my head for hours at coop the first few weeks was a dead motherboard. Because of a burnt diode. A piece no bigger than 2mm by 2mm on a motherboard of the ATX size (200 some millimeters by 300 some millimeters)

Go figure... lol

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 Re: Motherboard blues
Posted by Foxpup on Sun Jan 2nd at 2:52am 2005

If you completely melted a jumper, then you've got a serious problem somewhere... Have it checked out before you melt something more expensive. [addsig]



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 Re: Motherboard blues
Posted by Andrei on Sun Jan 2nd at 4:29pm 2005

I've managed to read what the blue screen says (using a digicam in burst mode ): UNMOUNTABLE_BOOT_VOLUME. But this could be caused by 1000 types of errors in the F.SYS.

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 Re: Motherboard blues
Posted by Wild Card on Sun Jan 2nd at 8:35pm 2005

Linux? Do you have a partition on your hard drive?

Can you get to the POST test screen? If so, go into BIOS and set first boot to floppy then insert one with partition magic (FDISK) and check for a partition on your hard drive. Thats what Im thinking.

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 Re: Motherboard blues
Posted by Loco on Sun Jan 2nd at 9:47pm 2005

The split second blue screen of death - something I'm quite familiar with due to Half-Life 2 - is apparently caused by components getting too hot. Windows automatically shuts down after this error to "protect" components. Having said that, this isn't the source of my problems with HL2, so it could be something else.
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 Re: Motherboard blues
Posted by Andrei on Sun Jan 2nd at 10:04pm 2005

Thanks for the help, guys. I've managed to solve the problem VIA the XP CD setup. Now, if i could only figure out why that cable melted...





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 Re: Motherboard blues
Posted by Wild Card on Sun Jan 2nd at 10:30pm 2005

Best guess, spark. Definatly not due to case temperatures. [addsig]



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 Re: Motherboard blues
Posted by Andrei on Sun Jan 2nd at 10:47pm 2005

It is possible. I used to make spark-detonators for my...ahem...alcohol bombs with partially separated wires.






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