If you go the route of finding your own replacement GPU, Dell may still have them. They're ~$300, but you're guaranteed a working part as opposed to what can be found on Ebay or other sites.
alright thank you all for your answers, what I have in mind for the problem is to verifiy if its indeed the gpu, i will try to find a local shop that has a replacement gpu and pay some cash to at least confirm that the gpu is bad.