What have you tried? Just trying to get a handle on what you've already done.
However - have you tried this: switch your 'renderer' to software only. Go to > File menu > Project Settings > General - under Video Rendering and Playback change from Mercury Playback Engine GPU Acceleration to Mercury Playback Engine Software only.
(or if it was already set to 'Software only' switch to GPU.)
Also try preview rendering your project - once you've done this - does it play fine from the timeline? If it does - when exporting tick the 'Use Previews' check box in the lower part of the Export window dialogue box. See if you get a visible export when trying this.
You don't mention if you are PC or Mac. If PC you may want to check the driver for your GPU is one that Adobe 'bless' for use with Premiere Pro. Good luck