I switched my graphics card with another one. My system booted up to windows and worked fine, but there was a grey screen twice for like a mili second as it did. It was quite an old card and I just didn't feel comfortable so I shut my system down, replaced the card with the original one and booted up again. Then I got a blue screen, it restarted, troubleshooted, restarted again into bios, where I booted up my system and everything seems fine now and I can play games etc.. Maybe it was because I hadn't installed the drivers for the new card beforehand?
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