hey, i can't get the e flat out of my oboe, does anyone have any ideas on what might be the problem?

well im playn on a new reed. umm, i think that one of the keys won't close the hole completely.

With the oboe unassembled do you see one key open when you depress the Eb key, and close when the key is released?

It's an adjustment screw. Press down your Eb key- do you see the key that moves up? It's right below the low trill C key. The screw on the other end of it is probably out of adjustment. Take a screwdriver and I would think tighten it.. I'm not sure what your situation is. Remember where the screw is set, and experiment with it for a little bit. If it doesn't do anything, return it to it's original spot, and take it to someone to be checked.

One thing could be you need to make a more "O" shaped in your mouth to get the sound out.