So, the power supply on my old dell Inspiron 8400 bit the dust and they don't make them anymore so I can't replace it. Someone I work with happened to be getting rid of his working Inspiron 531. My hard drive is better than his though and I want to transfer it over and use it to run the new computer. I put it in but it won't boot, it tells me I have to repair it but it won't do it when I try. What do I have to do to make this work?