1 pointhm. Quadro NVS 135M is based on the 8400 series. i seem to recall there was a lawsuit way back regarding nvidia selling faulty gpu chips. http://hothardware.com/cs/forums/p/51200/382885.aspx not sure if yours is covered but your laptop was built around the same time. it could be you just lucked out and the defect didnt show itself until now.