Our OB/GYN office is currently using older PC’s on a Linux network to run our medical software. Some of the PC’s have crashed and burned, but we cannot afford to replace them right now. I would like to replace the motherboard and processor in one and the hard drive in the other. My question (from a NON-IT type) is how do I select the right equipment (motherboard/processor, hard drive) for these PC’s? If I upgrade to a faster processor, will the old hard drive still work? These machines don’t have to be blazingly fast since we’re basically using them as workstations.