First of all You should check pressure of carrier gas, maybe system is not sealed, second think inject solvent and check signal for it. Then check Your system of injection, maybe there is a problem; what was the concentration of analytes? mybe there were lower than LOD? what kind of detector did You use? I hope You will find a resolution very fast:) regards
If No peak exist and no solvent peak appears also. Make sure your detector is on and your injector and liner are ok and if you work with split mode try to reduce the ratio or work with split less mode.