iMac will not shut down with apple menu
I can no longer shut down or restart my iMac using the Apple drop down menu, only the power button. I know this is not preferable, I get the message that I "shutdown because of a problem" every time I restart with the open to last known windows option. I'm using El Capitan 10.11.6 on a 2007 iMac w/2.8 Ghz Intel Core 2 Duo, 4GB 667 MHz and a 4-month old Crucial 2TB solid state drive. I've read many other threads and found no match to this problem. I don't have anything freezing. I've done a HD check with Disk Utility and no errors were found. I always close open programs before shutting down, and Activity Monitor shows no CPU hogs in action prior to trying to shut down. Other than auto-updates for various programs the only thing I've added in the past couple of weeks when this started is Dropbox and Go To Meeting, both needed for a project. I went back and eliminated those when the job was done, still have the problem. Running the pay version of ClamXav, up to date and last scan revealed no problem files. I would try a restore to a previous setting, but just coincidentally my WD My Book crashed and I had to re-format so have nothing to fall back on.
iMac, OS X El Capitan (10.11.6), 2TB SSD, 4GB 667 MHZ DDR2 SDRAM