Hey guys! Long time lurker here - I hope you can help me out with some advice.

I recently got an Acorp 6VIA/ZX85 ver 1.8 mobo and a 1000 / 256 / 133 / 1.75v Coppermine CPU (Pentium III SL52R). I am having trouble getting it to run at its nominal frequency, i.e. 133 x 7.5 = 1GHz. When I short 1-2 and 3-4 on JP7 (per the motherboard's manual, this should give me 133MHz FSB), the system won't POST. All other configurations work - 66, 100, and even a 124 FSB overclock in BIOS. The motherboard's capacitors are fine, and I am using a good 700W PSU that has been tested with various other rigs. The RAM is not the issue either - I tried multiple PC133 sticks. Clearing the CMOS didn't help.

I would really appreciate your help with this!