Crisis averted. Cleared CMOS via jumper pins, system posts once more. So far, every time a change has been made that didn't post, it's been to enable XMP... maybe just got unlucky with the RAM not wanting to run at rated speed?
Crisis averted. Cleared CMOS via jumper pins, system posts once more. So far, every time a change has been made that didn't post, it's been to enable XMP... maybe just got unlucky with the RAM not wanting to run at rated speed?