I have a Fender Frontman 15G amp and about a month ago I got a new cable because the previous cable was a bit loose in the input jack on the guitar, and the new cable solved the problem perfectly.

Now i have the exact same problem on the amp; could there be a problem inside the amp or will a new cable solve the problem the same? thanks in advance for any help.
Well, is the actual input jack loose? if it is, try tightening it a bit with a wrench(sp?) of some sort. Other then that, I woulden't know whats wrong.