Why Does My Computer Take Forever to Boot Sometimes?

Before diving deep, try reinstalling your operating system. That could resolve a lot of potential issues right out of the gate!

Quick question! Once your computer finally boots up, how does it perform? Is it responsive, or does it still lag when you click around?

It sounds like you're dealing with a couple of possible issues. First off, it might be a software problem, like an outdated Windows version or drivers. You could try updating your BIOS and making sure your drivers are current. If that doesn't help, a clean install of Windows from a USB stick could do the trick. Check out a guide on how to do that!

On the other hand, if the problem persists, it might be hardware-related—like a failing hard drive or issues with the motherboard. In that case, I'd recommend taking it to a service shop for a proper diagnosis instead of just swapping out random parts.

Have you tried disabling the 'fast startup' feature in Windows? You can do this by going to Control Panel > Power Options > Choose what the power buttons do, then uncheck 'Turn on fast startup' and save the changes. This sometimes helps with booting issues.

Also, how old is your computer? Age can really play a role in performance, especially with hardware.

We really need more information about your machine. For example, is it an Optiplex 790 from Dell? That could help us troubleshoot better. If you're using an old hard drive instead of a solid-state drive, that's a big factor in slow boot times. Consider upgrading to an SSD if you can!