I was told by many people it was easy to upgrade, its not. You can forget a cable or not have enough space, somethings may not be compatible. Make sure you have enough space and all cables are plugged in, more importantly that your PSU has the cables necessary for your system. Having almost broken my new PC, trying to upgrade to a HX750i and R9 390. The HX did not fit (it did just not enough space for cables and it was scraped (has dings and dents on sides). Since I couldn't get the PSU to fit in i placed the stock undefined one back in, forgot to plug HDD and lost all data. Id recommend bringing the case to the store and checking if the gpu or psu fits, don't make the mistakes i did, they were silly. So how does one upgrade the m32BC-bo1?