The Photoshop Icon starts to bounce in the dock then stops.
There are no error messages.

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If Photoshop hangs or quits before it finishes launching it may be because you have installed Scanning Software which has badly-coded Drivers (such as those from Epson) that are incompatible with Photoshop's TWAIN plug-in.

Go to Applications/Adobe Photoshop/Plug-ins/ImportExport/TWAIN.plugin

Disable Photoshop's TWAIN plug-in by putting a Tilde (~) in front of its name like this

~TWAIN.plugin

Then use your Scanning software as a stand-alone Application to scan from OUTSIDE of Photoshop.

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This was submitted by Ann Shelbourne.