I installed W7 on a 64gb SSD. I also had a 1.5 TB HD installed. Everything booted fine.
There's a problem with the 1.5 TB HD and I need to return it. However, when I take out the 1.5 TB hard drive and try to boot, it gives me "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key".
It doesn't matter if I change the boot order or try to boot directly from the SSD. Same error.
That happened because you had your HDD connected when you installed Windows on your SSD. Windows installed the O/S on your SSD, but it also installed a system reserved partition on your HDD.
Backup any necessary data and perform a fresh Windows install on your SSD.
This time makes sure it's the only drive connected. After the install is complete you can then shut down and connect any remaining drives.