Question: Issues w/ the Solve Function

I just purchased Maple16 and am working on a problem where I need to solve for variables which are imbedded in non-trivial equations. When I first began using Maple16 to solve for these symolic variables, the solve function worked; however, after about 45 min of using the solve command, on non-trivial equations, it would output nothing and the cursor would move down to the next line. A simple equation such as: f(x)^2-g(x)f(x)=s(x) it will still solve. Has anyone ever experienced a similar problem, and if so, what was the issue and how did you resolve it?

FYI - I was working in Maple 2-D and the memory consumption of one of the three worksheets was over 77 MG, the second sheet was over 31 MG. Saying this though, there was no memory warning sign stating memory was depleted or running low. I have closed those and opened a new sheet with a single equation to solve and the solve function is responding the same way.