New external SSD is visible in Device Manager but not the list of drives in My Computer

May 25, 2017
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I have a usb connected new 500GB Samsung 850 EVO . I have already formatted and partitioned it and, in Device Manager, it shows up as "Healthy ( Active, Primary Partition)." However, it is not showing up in the list of drives in "Computer." OS is Win 7 Ultimate 64bit. Any suggestions as to how I can get it to show up will be greatly appreciated!
*** UPDATE *** Well, this is odd. I unpluged the drive from my main PC and plugged it into my notebook (OS is Win 7 Pro 64bit) and it showed up in the list of drives in Computer. However, I plugged it back into my main PC and, even though it made the sound of a new USB connected device, it still does not show up in Computer.