I cleaned my keyboard by taking out the keys and wiping the exposed surface with a wet sponge and detergent. After reassembly, some of the keys don't work. Before I put the keys in, I tested the board with a screwdriver, they worked then,but after everything was done, the following refuse to respond: F1, F2, 1(Top left), TAB, Q, W, E, R, T, Y, U, CAPS LOCK, SHIFT (Left), and C. Any suggestions?

Let it sit for a day or two...it may have gotten damp.

Give the keyboard a sideways punch. This ought to move the rubber contact cones back in their original positions.

No harm done if I have already plugged it in, right?
I opened it up when it wasn't working and saw some of the silver leads had turned black. There didn't appear to be any moisture inside and I made sure all contacts were in place.