Question Computer won't boot even to BIOS

[nicsh]

So, my computer was working normally. I go away for a few hours and then boot it. It gives me the "no operating system found" message. Then after I restart it, it doesnt boot. Only a black screen, no windows logo or anything. Fans and everything are running normally. I installed a new HDD a few days back, could that be the problem? I only got a couple of games on it

 

[william p]

Try putting the old HDD back in.

 

[nicsh]

Try putting the old HDD back in.

The old hdd is there. I just installed the other to be a secondary one