About 3 weeks ago, shortly after Windows 10 was released, I went thru the Windows 10 upgrade in place procedure on my HP 590t I7 processor desktop machine (which had no problems prior to the upgrade). About 10 days afterward, I believe following installation of a Microsoft rollup update, each time I chose to "shut down" the PC, it began to shutdown (all power lights would go off, and all activity cease); and after a few seconds would restart. I have searched the internet for solutions and have tried all that I could find. For example, I have disabled in BIOS the "wake on LAN" option; I have removed, thoroughly cleaned, and replaced my CMOS battery; I have checked all my Power options and found them to be set correctly. I have always disabled the sleep and hibernate options on computers I use. All these actions have been unsuccessful in correcting the problem. Now, each evening when I shut the computer down until the next day, I'm forced to wait for the computer to shut down, then wait for the inevitable restart, and hold the power button down until the actual shutdown occurs.
If anyone out there has any suggestion(s) as to how I might correct this problem, I would be very happy to receive them. Of course I can furnish any further details determined to be necessary, but I am convinced the problem has no direct relationship to my individual hardware.