Programming an ATtiny85
Before you panic (try not to panic) and buy new chips, test the existing ones. See my page about detecting chip signatures which has links to code on Github for a sketch you can run on your Uno, to test the ATtiny85.





You can also upload code from a .hex file (which the IDE produces) by using a different sketch (same code link) from this page about a hex uploader and wiring like this (you also need an SD card adapter):





The first sketch and wiring should at least confirm your chips are OK. The second one is an alternative way of programming them.