My XPS studio 9100 has a failed OPU test. When I ordered what I thought was a replacement ($95), the tech guy who came to replace it said that it was not an OPU, but a hard drive. I ordered the only other available thing on my replacement parts list, a cd dvd which has been backordered twice now. The disk drive in the 9100 does not work. How can I get some help with this! This XPS has been nothing but trouble since I bought it! Thanks for any help, please....