Will my mother board fit this case ?
Yes. The form factor for both the motherboard and the case is ATX, so unless the documentation on the websites you provided are mistaken, you are good to go.
Will this CPU fit my mother board?
You'd have to email ASUS tech support for a correct answer. The specs show up to the 540m.
Can i instal windows vista on this mother board P4M800-M7A?
If there are not any drivers for vista then no, it is not compatible. Some newer pcs only support windows 7 and do not have drivers for older OS's.
Will these fan headers work on a mother board?
Unless you have experience with soldering and unsoldering, don't do it yourself.
Will this Hard Drive work with this External Case?
There were two versions of similar HDD. One was SATA and one was PATA.http://www.hgst.com/tech/techlib.nsf/tecâ€¦If your model was Pata,You need USB 2.0 to IDE/PATAhttp://www.tigerdirect.com/applic...
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