Computer on but monitor says no signal

I know this has been solved and it worked for me as well. Remove the power cord hold the power button for a minute then power up again and BEAUTIFUL worked. My question is WHY did I have to do this and should I be worried because this is a BRAND SPANKING new computer? I literally just bought it on Friday June 1st! This NEVER happened with my old computer. I had tons of issues with it and it's why I broke down and got a new one but I never had THIS issue.

Now, my old computer never did the sleep thing with the monitors. I had to turn off the monitor off at night or the light on the screen would stay on all night. Not sure if that's the case with these newer computers.

I just want to be sure I shouldn't take this computer back. Isn't it too new for me to have to be looking up "fixes"? I was so sick of looking up fixes with my old computer I thought I was done with that for a long time with this new one. Everything else works perfectly. I'd hate to have to be doing this all the time. =/

TIA