New monitor is not showing anything from my new tower.

[VanityHope]

Hi, I just got a pre-built iBuypower gaming PC with a new monitor today and I set up everything and put everything together from VGA to HDMI, but nothing is working. The monitor is still black. The only time the monitor shows something is when I turn it on after a few seconds in which it flashes its logos and goes black and then my power LED for the monitor starts blinking blue. My friends told me that PROBABLY my graphics card is not sending a signal to my monitor (I also tried this on my old computer and it still didn't show anything on the screen at all.) How do I fix this? I don't really know anything about computers THAT much so if you tell me to dissemble can you please tell me how to? I just want my monitor to show something from my tower. My tower is working completely fine. The fans and everything is going and turns on perfectly. It's just that monitor that is not working and I don't know what to do anymore after working on this for 8 hours.

EDIT - I found out it isn't my monitor. Since I tried it with my laptop and it works. It's my PC. Now how do I fix that?

 

[GokAy]

Why are you using the VGA output? If this is a new PC and monitor they should both have DVI.

Or at least use (DVI to HDMI) or (HDMI to HDMI).

Check in BIOS for a preferred output device setting. Read the manual. Also check monitor for a source select button.