When i changed my gtx 950 msi to a rx 470 4gb and my psu from a corsair 350vs to a 550vs my pc would not boot and gave no signal to monitor. when i changed all of the parts back it had corrupted my hard drive at a hefty cost to my bank account. Is this because i changed my graphics card without clearing/ buying a new hard drive or is it because my power supply distributed the power incorrectly? If it is the later i shall be sending a very p****d off email to corsair asking for a refund and compensation. Thanks for any help in advance <3