It's quite possible that you may have downloaded something that could have effected your RAM, BSODs usually happen due to software and hardware problems. if you could post abit more info, for example, any programs or software you may have downloaded prior to these events, it'd be extremely helpful in solving this problem. It'd also be helpful to know what version or OS you're using for your pc, such as Windows 7 or 10, and to let me know if perhaps your machine emitted any beep codes, that'd be most helpful. For now, follow Laptop master's instructions to see if his method works first, if it doesn't, proceed to give me the information.