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The original power supply from the factory is very weak and under-powered. It will likely burn out if you add a graphics card or a second hard drive. I've upgraded and replaced the power supply on all of my Insignia computers so long ago that I cannot remember what the originals were, but any standard ATX power supply should fit the case and motherboard. I recomend at least a 400 watt to cover just about any PCI card upgrades, added hard drives or extra cooling fans, since that wattage can be found reasonably priced now.
Contact the computer manufacturer. Once they verify system model & serial # on the phone they usually will send a replacement recovery cd at little or no charge. Hope this helps & please take a moment to rate this solution. Thanks.
According to Insignia, this case uses a micro-ATX board, so that's what you'll need. You might also want to replace the power supply too. The specs don't say what wattage they supplied, but they're usually pretty undersized in these factory machines. You'll probably need a new hard drive as well, unless you make sure your new mobo has two IDE channels. The original hard drive is parallel IDE and most new uATX boards have only 1 IDE connector but lots of SATA connectors. (A place I like to shop for parts is newegg.com.)
You'll have to search around but all your drivers are in intel's website. Except for one, and thats your media reader, you'll have to use to one supplied on your recovery disk that came with the D400A.