http://www.tigerdirect.com/applicati...5&Sku=B69-4086 this is what i reccomend if you have to replace the MB there are others on this website but for the price and power you cant beat it. I have had this one in my PC for about 2 yrs and havent had any problems out of if. and as far as your hard drive problem if you have a External hard drive put an operating system on it and try booting your system useing external drive. if it works then i would either be your MB. If you need something shoot me a PM.