I recently bought a western mini blot system from invitrogen, The gel runs fine but when I try to transfer it the sponge pads and filter paper get really hot but the proteins don't actually transfer to the membrane. Other times the power supply just gives me an error message that there is a short circuit. Initially fix the voltage at 100 but when I run it the voltage only goes to 15 but the current runs at 3 amperes. Does anyone have an idea what could be going wrong?