wait what? reword that. lol. I also got a new gpu, i installed the heat sink, then the gpu. Then i turned it on, and there was no display. So I removed the gpu and used the integrated graphics to see if it would display but still nothing. So is that what you mean?
Does the GPU have the 6 pin power connector connected from the PSU (might be 2-6 pins or a 6 and an 8 pin connector). Do have another monitor or HD TV that you could check it on (using an HDMI cable for the TV).
If it POSTs (one beep) then everything is in order as far as CPU and RAM. I would double check the monitor settings (if it has analog and DVI inputs) to make sure it is set for the one your using. Also, if you have another cable (VGA or DVI, once again, which ever you are using) and check that. DVI cables are cheap (under $10(US)). It is funny because the motherboard should autodetect if you are using the IGP.