My Option key will not show me all my drives at boot up  but I can see then on my desktop

I have installed a SSD in my system and can see it on my desktop but I can not get it to aper when I use the option key at startup. The drive is formatted correctly (one partition Mac OS Extended (journaled) and set the GUID Partition Table) I was able to see it last week now no way will the option key work. I even used a different key board with the same result. the purpose for the SSD   I am going to install new OS on this drive.

How to choose a startup disk on your Mac - Apple Support
A "startup disk" is a volume or partition of a drive that contains a usable operating system. You can set your Mac to automatically use a specific startup volume, or you can temporarily override this choice at startup.
If you do not have usable operating system on your SSD, it won't appear on the Startup Manager window.
drivemaster wrote:
Do I need to do this?
Yes, if you want to have your SSD visible on the Startup Manager screen.
How to do it. Use Recovery Partition to install OS X on SSD drive. OS X Yosemite: Reinstall OS X

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