My monitor won't display anything

I came home today and restarted my computer. When I did, it said no signal, check cable. I saw that one of the pins on the cable was pushed in so I tried another cable, and now when I turn on my computer the monitor just stays on stand-by mode not picking anything up. It was working fine.

I went to Best Buy, bought another Video Card and popped it in but still no luck. It's the exact same. I have no idea what to do. I've tried different PCI-Xpress slots, I've checked every cable I can think of, but still no luck. I'm at a complete loss.

The fans turn on, the hard drive light turns on, the graphics card, heat sink, green light for the mobo. Any ideas?

And I'll let you know, F8, BIOS, all that is out of the option, as my monitor does not pick up anything.

Try reseating other parts of the computer. Usually lose ram sticks will cause a blank screen. Reset the CMOS if you have to by taking out the battery on the mobo for a few seconds.

What video card is it? does it use a PCI-E connector? it's possible you lost a 12V rail. What PSU do you have?

Also, I've reset the CMOS, and nothing comes up.

Let it sit for a long time without any result of windows showing up, as well as pressing DEL key and F8 key when it boots up.

Yes, both to my monitor, and my TV, and with a new VGA cable and with my new Graphics card.