since i installed the new os Yosemite on my mac book pro my battery life has been cut short and my systems keeps running and making noise like programs are running in the background that are not responding. mean while there are no programs running. a

run activity monitor (it is in /Applications/Utilities), click the CPU tab and see if there is any process there that is taking a lot of CPU resources.

Post a screenshot of what you see.

Hey funlola,

there are apps like Dr. Cleaner or Memory monitor on the App Store. They'll show you which programs are running and you can optimize your system... well that's how I'm doing it.

I had this problem too at first.

1. look at Activity Monitor (Applications → Utilities → Activity Monitor) and see if there is some background process running that is the culprit. Use Activity Monitor on your Mac - Apple Support
2. look at Console (same place) and see if there is an error message that will tell you what process is the culprit http://computers.tutsplus.com/tutorials/how-to-use-console-your-macs-diagnostic- diary--mac-45251
3. download and run Etrecheck http://www.etresoft.com/etrecheck and paste the report here and we can take a look and see what the problem is.
4. use Disk Utility (same place) and run First Aid on your hard drive and volume(s) on the drive.
5. check the battery on your Mac: Check the battery condition on your Mac - Apple Support
6. try an SMC reset Resetting the System Management Controller (SMC) on your Mac - Apple Support
7. a lot of things can cause symptoms like you are describing. How old is your Mac? the HD may be failing. The battery may need replacing. Your HD may be too full. You may have installed software like MacKeeper or CleanMyMac which has screwed up your Mac.

Just saw Tarry's post.

Any apps that purport to "optimize" your Mac are a very bad idea.

Why?

They are unnecessary and harmful.

In your screenshot there clearly is a process using an inordinate amount of resources: com.hp.devicemodel...

Most likely this is a remnant from an older instalation that does not play well with Yosemite.

Arthur's advice is solid: you should stay away from most programs that claim to "clean" your mac...