My second HP Z240 to crash, first one returned. SSD fried. The 512GB SSD didn't last 3 months. It cost me $216 to have Best Buy find the problem and $45 to but a new SSD. Beware of refurbished equipment. The SSD looks like a knock off, but the small print says Samsung, mfg 2016.  i could have and should have bought a new one for this much time, money and effort. All my data lost.