Not sure I can offer many solutions, maybe just some data points that hopefully will
eliminate some possible causes...
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CPU is 1.8GHz Williamette P4 so i'm using a 266MHz FSB proc. with 400MHz RAM. I assumed this wouldn't be a problem (planned to upgrade to an 800MHz Northwood at some point later) - bad assumption?
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Near as I can tell, the "Willamette" processor (not Williamette btw) was the codename given to the 180nm technology Pentium 4's. The 130nm technology is certainly the Northwood (which I've got), and Prescott went to 90nm. A Northwood CPU would be the best choice for this mobo model.
In the 1.8 GHz CPU class, it appears there were only 2 models of
P4 processors:
- 1.80A GHz 400 MHz 0.13 micron (Northwood)
- 1.80 GHz 400 MHz 0.18 micron (Willamette)
Now, according to the
Asus CPU support matrix tool for Socket 478 processors, both of these
should work on your P4P800-E, even with the base BIOS. That's not to promise that they
really tested it, but at least it is on the list.
Do keep in mind these CPU's have a 400MHz FSB, not the usual 800. Your mobo's i865PE Northbridge chip does support 400, in addition to 533 and 800, and any setup required for that should automatically be handled through the BIOS, assuming the BIOS tuning is set for auto. Your 1.8Ghz CPU shouldn't have the 266MHz FSB you described, not unless I'm missing something at the Intel site, or unless they've pruned some older data over time. And the i865PE datasheet makes no mention of 266 (for the FSB), so if indeed your CPU is FSB 266, you may have answered your own compatibility question.
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When I plug CPU in alone, I get a vocal post of "No memory found" along with some beeps (1 long, 2 short). However, when I plug the memory in (filling both blue slots), I get no vocal post and no beeps
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Those are the correct memory slots to use. In terms of beeps, it sounds like your mobo is correctly detecting the presence of memory.
My guess is you're using a PS/2 keyboard and a PS/2 mouse, right? Because if so, zero beeps is normal. In the absence of errors, these mobos will beep once per USB device enumerated at bootup. They don't issue the traditional single beep at completion of POST. No attached USB devices would mean no beeps.
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I get...no video if a videocard is plugged in
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Getting no video is a very common problem, and tough to diagnose since there are so many possible causes. It
could be a memory/CPU issue, however I'm inclined to look at other things first.
Why not start by telling us what video card, and what power supply & wattage you're using. Make sure the supply is ATX12V compliant, and that you've attached the extra 4-pin square ATX12V connector to the mobo; the jack is on the mobo, behind the LAN port. If the video card has an extra power attachment port on it, make sure that's connected to one of the wide 4-pin power taps, not the floppy power taps which are smaller. Check your monitor to make sure it's functional. And make sure you've connected the CPU fan.
-clintfan