Different MB but I had the problem of not having suspend-to-ram enabled in the bios at the time I installed XP. Nothing I could do fixed it (and I sure tried lots of things!). I re-installed XP (with the bios set right this time) and suspend has worked perfect ever since. If you had it disabled in your bios at the time you installed XP, that could be the problem (i.e. non ACPI HAL installed).
Hmmm usually +5vsb are jumpers on the motherboard to supply power to the serial nd USB ports to keep them alive during suspend. As jsl10 mentioned it could be an ACPI issue, which may require a reinstall of XP in order to have the ACPI kernel installed. If you have multiple partitions on your drive you could install a second copy of XP to see if it affects your suspend capabilties.
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