Macpro runs slow

[Lorrett]

mac pro runs slow how can I clean it up.

Is the grey line on the startup supposed to be there runs really slow

I downloaded disk Doctor but chickened out, not sure if legit enough and uninstalled it.

 

[JohnDS]

The first thing to do is to boot into the recovery mode by booting while holding down Command-R. Then select Disk Utility from the menu. Click on Macintosh HD in the left panel and select either First Aid or Repair Disk. Let us know what happens.