Many of the brand name cases use non-standard form factor motherboards, so I'd check carefully before ordering that board. OTOH, you can have a new case-P/S for around $50-60, maybe that's a better option if it doesn't fit?
I'm terribly sorry for being so nieve, but my knowledge of computers hasn't entered into deeper, shallow waters as of yet. My question is, 'What is, 'non-standard form factor motherboard?'", and lastly what is "case-P/S?" Again, I'm sorry for the unintelligible question.
The ATX motherboard has a standard size and mounting hole position. This allows you to buy a generic ATX motherboard and put it into almost any case from any maker. Most brand name PC, such as your HP, will have a proprietary motherboard that is likely not to be a standard size or mounting.
P/S is power supply. If you're replacing a motherboard, and it won't fit your existing case, the only stuff you should have to have in addition to the motherboard is the case-P/S as I mentioned. The rest of the stuff should be portable to the new system.
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