I have a Acer aspire XC-704 added an extra SSD and when turned on this appears "PLEASE Reboot and Select Proper boot Device"
So removed SSD and "PLEASE Reboot and Select Proper boot Device" still appears.
Remove power lead. Press and hold power button for 30 seconds. Open up case and carefully unplug and reconnect hard drive, both power and data leads. Chances are you have accidentally dislodged one or other.
Power up and see what happens.
As suggested by HondaMan do check the BIOS settings. I am guessing you want to boot from the SSD so ideally you want it on the lowest SATA port number but you could have it on any port as long as you change the BIOS settings accordingly.
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