I have a HP pavilion a6300f and if im right it has a foxconn nforce 630i motherboard. I want to overclock my E2180 cpu. I have gone to my BIOS but it doesnt have my cpu settings as selectable as in its gray and i can't click them. So can can i overclock the cpu with this motherboard? thanks in advance.
^No, it won't be locked BUT you won't be able to Install the OS provided by HP not to mention needing a re-install. Your best bet is to get a new case (possibly), and a new PSU (would be a good idea as those HP PSUs are sub par) and a EP/P35-DS3L(or P45 if you can get it).
Yes. You should be able to OC very well if you replace motherboard. The most common combo for that E2xxx is a P35-DS3L or if you plan to up to E8400 later a P45-DS3x. The CM 690 is a good case go for it. Mind listing PSU and GPU? Also you will need a good HSF if doing any serious OCing. I recommend XIGMATEK S1283 (+ bolt in kit) or Core Contact.
Looking at pics of your system, it appears to be just a standard mATX board and case. You might get away with just getting a replacement board, make sure it's mATX so it will fit your current case at least.
As for the OS, you can always try calling MS up and say that you upgraded, for them to re activate your key for the new motherboard. Won't hurt to try.
If i'm going to need a new mother board might as well buy a new case, i'm gonna get a cm690 case so whats a good motherboard for that? and can someone find out if my motherboard will let me get a new processor, because i don't wanna end up buying a new motherboard, case, processor, and OS. I just dont have the money for everything, i'm only 14.
for that case a good mobo would be a Biostar Tpower I45 if you going to stick with dual core and plan to overclock.but for a quad core setup in the future a Gigabyte EP45-DS3 or Asus P5Q Pro will do the job very nicely!