Difficulties with First Build

I have a Gigabyte MA770-UD3 with an AMD Phenom X4

my video card is Radeon Sapphire hd 4830

I put the system together, it turns on, but when i connect my monitor I get No SIgnal. Any Ideas?

Everything is checked

Do you have the monitor connected to the onboard GPU or the 4850?

What kind of PSU do you have? Makes a difference.

Start simplifying. Pull the 4850 and connect to the onboard GPU. That does three things. It removes one potential problem source. It potentially drops the PSU 12 volt load by up to 6 amps. And with your monitor connected to the onboard GPU, you are to use the BIOS defaults.

If that doesn't work:

Pull everything except the CPU and HSF. Boot. You should hear a series of long single beeps indicating memory problems.
You do have a system speaker installed, right?
Silence here indicates, in probable order, a bad PSU, motherboard, or CPU - or a bad installation where something is shorting and shutting down the PSU.

To eliminate the possiblility of a bad installation where something is shorting and shutting down the PSU, you will need to pull the motherboard out of the case and reassemble the components on an insulated surface. This is called "breadboarding" - from the 1920's homebrew radio days. I always breadboard a new or recycled build. It lets me test components before I go through the trouble of installing them in a case.

If you get the long beeps, add a stick of RAM. Boot. The beep pattern should change to one long and two or three short beeps.
This part may be a little different due to the presence of the onboard GPU.
Silence indicates that the RAM is shorting out the PSU (very rare). Long single beeps indicates that the BIOS does not recognize the presence of the RAM.

If you get the one long and two or three short beeps, test the rest of the RAM. If good, install the video card and any needed power cables and plug in the monitor. If the video card is good, the system should successfully POST (one short beep, usually) and you will see the boot screen and messages.

Note - an inadequate PSU will cause a failure here or any step later.
Note - you do not need drives or a keyboard to successfully POST (generally a single short beep).

If you successfully POST, start plugging in the rest of the components, one at a time.

opps submitted to quickly anyways:
after a long time i tried to change the frequency UP it worked shocked me to hell but it worked!