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one thing looks suspicious - from Clintfan's Chipset Software Installation Utility post, I expected to see "Intel(R) 82875P Processor to PCI to CSA bridge", but I'm not
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You're right, it is suspicious if you don't see that item. Sorry, I think my thread may be a little out of date. I think Intel has changed the designation for that component. But there is still a CSY bridge device. Assuming your mobo model is P4
C800-E with the 875P chip,
What used to be called (in the XP\865.inf file) in ICSIU version 5.0.2.1003:
"Intel(R) 82875P Processor to PCI to CSA bridge - 257B"
"Intel(R) 82875P Processor to I/O Memory Interface - 257E"
is now respectively called (in the same XP\865.inf file) in ICSIU version 6.0.1.1002:
"Intel(R) 82875P/E7210 Processor to PCI to CSA bridge - 257B"
"Intel(R) 82875P/E7210 Processor to I/O Memory Interface - 257E"
The name of the AGP device did not change:
"Intel(R) 82875P Processor to AGP Controller - 2579"
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Any ideas? Is there some kind of hardware jumper I missed reading about in the manual?...Or is there something else obvious...I'm beginning to wonder if maybe the MB I bought (used) is actually slightly different than the P4C800-E ... maybe P4C800 or something similar?
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No, there are no hardware jumpers. There is a BIOS setting to enable the LAN, it is in Advanced- Onboard Devices- Onboard LAN=Enabled, and Onboard LAN Boot ROM=Disabled.
I can think of one obvious idea: all of the P4C800 series have the i875P chip, but if you actually have a different model, there might be no CSA. For instance if you really have P4
P800-E, then you will have a i865PE chip instead, and this one won't have the CSA bridge on it, AFAIK.
Make sure you are not barking up the wrong tree, and that you have the model right. Point is, one mobo has the Intel LAN, another has the Marvell LAN, and others have the 3Com LAN. Each needs a different driver. Let's first be sure what model we're dealing with here.
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I did flash the BIOS to the -E version
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This could be very bad news if you flashed BIOS for the wrong mobo, onto a mismatched model. Let us know what filename you used for that flash.
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I'll look through posts to see if there's a way to tell by looking at the board / chips
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Sure that is one way, and I can walk you through that. But first check the model number stenciled in big white letters between the PCI slots.
Hope this helps,
-clintfan