need help with solve()

I am a newbie to Maxima,
Please help me solve this set of equations, resulting from an AC KCL problem

U1: Z1=RR1+1/(S*CC1);
U2: Z2=RR2+1/(S*CC2);
U3: V1=(I1-(V1-V2)/RR3)*(Z1+Z2)/(Z1*Z2);
U4: V2=((V1-V2)/RR3-(V2-V3)/RR4)/(S*CC3);
U5: V3=(V2-V3)/RR4/(S*CC4);
solve([U1,U2,U3,U4,U5],[V1,V2,V3]);

I am interested in finding V3=F(RR1,RR2,RR3,RR4,CC1,CC2,CC3,CC4,S)

I get the following:
				    1
(%o2) 		  Z1 = ----- + RR1
				  CC1 S
(%i3) 
			      1
(%o3) 		Z2 = ----- + RR2
			     CC2 S
(%i4) 
				    V1 - V2
			      (I1 - -------) (Z2 + Z1)
				      RR3
(%o4) 		V1 = ------------------------
				       Z1 Z2
(%i5) 
				 V1 - V2   V2 - V3
				 ------- - -------
				   RR3	     RR4
(%o5) 		  V2 = -----------------
				       CC3 S
(%i6) 
				      V2 - V3
(%o6) 			V3 = ---------
				     CC4 RR4 S

(%i7) 
Inconsistent equations:  (1 2)
 -- an error.  Quitting.  To debug this try debugmode(true);


What am I doing wrong?

Thanks

Ilan
?
?