monitor says "no signal" after new system built

I've built a system with Q6600, GForce 8800 GT, 2 GB Ram, and 2 sata HDDs,
Antec trio 650 W Power source and antec 900 case.
The lights and fan go on, but the monitor says "no signal". what could be the cause??
I have inserted the VGA into a proper slot, but still the monitor gives this error. what could be the cause??
this is tht first time I've installled SATA disks - might it be that there is a problem there??

Did you connect the 4pin CPU power connection as well as the 24pin atx power connection? Also, is your 8800GT's 6pin PCI-express power connector plugged in? Your hard drives should not interfere with the initial boot up process, but make sure both the sata cable and sata power cables are secured in properly.

If that does not fix it, take the board out of the case and set it on the anti-static wrap it came in. Then try to power up with just the CPU, 1 stick of memory, and your 8800GT installed. If it works and powers up then, you know that you have a short somewhere happening in the case. Make sure your risers are properly installed in the case.

Post back and tell us what happened.

Here is where the 6 pin connector goes:

omermaras you will have to use power connector from video card,useing two seperate 12 volt 19 amp rails.

You say your case wires arent hooked up? You need to hook up your tower cables for your power button a reset buttons. You definately got to hook up the 6 pin power plug to the video card as well. If your PSU has a 6 pin plug you dont need to use the adapter in the above picture.

It couldn't be any simpler if you take the time and read your manuals.

I've had this same proble with my Asus P5W DH Deluxe mobo... it ended up being related to the RAM... if i popped out the memory and tried both sticks of ram one at a time in the first dimm slot, i got it to turn on and work normally...