Could be a grounding problem- check that everythings properly grounded and there isn't anything that is shorting. Are you using a plastic Infinitiv tower?
Check the accelerator pass through is connecting properly with the Mediator busboard. You may want to cable tie each end through the loops provided for extra stability.
Also check that the FastATA is pushed properly into the kickstart sockets and the Gayle adapter is secure (and flush with motherboard).
What keyboard adapter are you using?
Also check that if you are using any Y-power splitters that the pins are fully inserted into the plastic shrouds.
