You die. Blank. You cannot see or think or anything. There is nothing after death, you're dead.
The only reason you can see is thanks to your brain and eyes. Once those fail, you can't see or hear, and your brain shuts down. You basically don't exist anymore, that one spark of energy and that lump of flesh and organs you are, you're one big machine that powers itself, and it isn't guaranteed for life.
But death is curable. Yes, very curable. The only reason you die is because oxygen stopped getting to your brain. If your body gets chopped in half, oxygen stops getting to your brain, if you lose too much blood, it can't carry enough oxygen to your brain and if your heart is stabbed, it cannot pump oxygen to your brain.
The way to fix death is to supply oxygen to your brain through more a cautious and tougher system that IS man-made.
But this will never happen.