Which is the best hdd for mid 2011 imac

I am bit confused to choose from these 1TB 3.5" HDD
1. Seagate
2. WD Green
3. WD Black
I mainly use this iMac (21.5", Mid 2011) for Photoshop with large files from 800MB to 3GB. Some video editing etc.
Also I don't know the WD Black is compatible with the power supply or not as the HDD require more power than other HDDs.
Please suggest.

APC is a fine brand and probably the most recommended on these forums. One major error I see you made is to install PowerShute, it's simply not compatible with OS X and should not be installed. You should contact APC Tech Support for instructions on how to correctly uninstall it. I think once you do if your KP's are related they will go away. You should handle this first, don't just trash the software, that will not get rid of it. You need to follow APC's uninstall instructions, I know because I found out the hard way.
If all that is wrong is the battery has died then simply get a replacment battery. You can buy replacements from APC or from a battery distributor, I've even seen them on EBay. They're about like car batteries, when they go dead you replace it.

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