Help random pc freezes, and very slow bootup

My pc boots up very slow and shos the loading bar for a while ,while there is no hd activity.
Also when doing something like browsing the internet,
{also happens when there is alot of hard drive activity}
it randomly freezes, it does not respond ,after 5 minutes it goes to a black screen with only a mouse that i can move i have to cut the power { :sweat: }and restart
Pleasee help me !
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More about help random freezes slow bootup
  1. A good place to start would be your RAM. Swap some out or run a 'Memtest86' to find out for sure.

    Let us know how it goes or if you need more help. :)
  2. Post your system info, when you started having problems, etc.
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