irum208 Said:
"MacBook Pro 2008 not working: I have MacBook Pro 2008. Couple of days ago I shut it down. When restarted, it shows Apple logo and prohibition sign. I updated it to Catalina and after then it’s taking forever to start. After entering my password it takes time and then back to boot up. Help please"
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Try Booting into Safe Mode:
See what happens when you boot in to Safe Mode. You [Hold Down the shift key upon boot], and see if you still get this error. In Safe Mode, login items do not open at login, certain preferences are set aside, and damages system files are intentionally fixed. So, see if you can boot into Safe Mode, and get it just fine. Then, restart the Mac normally. Report back how it works.