Mouse And Keyboard Won't Give Signals / Respond

About a month ago my computer started acting very strangly, not giving me an signal from my mouse or keyboard and after a couple of restarts wouldn't give me any display or post when i started it up. I recently decided it was a motherboard/psu issue, and bought brand new mobo and psu. Well now it starts up just fine, but still won't give me keyboard or mouse signals, either from either ps/2 or usb slots, and i know both the mouse and keyboard are working otherwise. The optical mouse turns on, and the keyboard lights flash briefly right on startup, but i can't even enter my bios.considering it's a brand new mobo i assume i have a corrupted windows or something along those lines, though it seems strange that i wouldn't be able to enter setup before startup, so i'm not even sure how i could do a reformat without a working keyboard, any ideas would be very welcome.

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