New desktop, no signal to moniter
I have recently purchased an Acer 20" Al2016WBBD widescreen moniter, and a HP Pavilion a1767c desktop and upon unpacking everything and plugging it in, there is no signal to the moniter. Everything is powered correctly, the tower makes no beeping sounds of any kind, the cable to the tower and moniter are definitely secure. When I turn on the tower the fan in back is definitely working, however when I turn on the moniter it flashes a no signal screen, and then goes blank and the light on the power button turns to orange. There is also a small latch on the back of the computer preventing me from opening it up to look inside and make sure everything is OK and I am at a loss for what to do
HELP!