Oh is your oboe wood? Have you looked for any cracks in the top joint?

@@OboeFiles It is a rosewood Full conservatory oboe, no cracks thank goodness. I managed to get C, B natural, A, Ab, and G however the Bb is way out of tune, it is almost a step up sounds like a C now. Plus the lower joint completely wont work. Any suggestions I just got this oboe yesterday and it worked fine until when I played it again yesterday night it completely did not work.

@@OboeFiles I found out what was the problem i dont know how to fix it though.. by the A key there are two screws literally right next to each other one on the left and one on the right, when i hold the C, A, G and F# key in the front, I push the left screw and it has more room to go up which makes it be able to produce the low notes. but when i dont hold it down it falls down a tiny bit and no sound comes out.

Awesome! I hope it helps :)