Computer not bringing me to login screen

Hello, I have recently been using a Dell Laptop and It has had no problems since I got it. When I was using it, it shut down on its own, and when I turned it back on, it brought me to a weird looking white screen with an error message, and it scans for an issue, but when it is scanning, it shuts off on its own and doesn't turn on again. When I turned it back on, I ran a Diagnostic test to see what the problem was, and it turned my screen into a bunch of lines that were different colors, and shortly after, it asked me if I saw all different colors, and I answered yes. It then started to scan for the issue, then started to beep really loudly every 4-5 seconds, and it beeped about 3 times before I closed the computer because the beeping was super loud and obnoxious. I sent it to the Dell company to figure out what the problem was, and it went on a little trip back and forth to get fixed, and it turns out there was something wrong with the hard drive, and once we got it back, it was working fine. However, a few days after I started using it again, it went went back to this issue.

I don't want to send this laptop back to the Dell company and pay even more money to get it fixed AGAIN and have it break again, and have to do this process once again.

Please help!