Everytime i turn my PC on it goes to a grey screen, any help?

[Microsoft Windows]

Everytime i turn my pc on it kept turning to a grey screen, i kept restarting it and it eventually let me log in, but soon after it went grey again. the only apps i had open were steam and discord when i went on. discord was updating and so was steam. i have turned my monitor on and off but i do not think its that. I picked the monitor up yesterday at currys, its brand new. i just asked for the best in stock. While on the grey screen it doesnt let me do a single thing. not even alt+f4. any help?

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