I turned off my Intel HD 2000 graphics and now my PC stopped working.

Eximo

Titan
Ambassador
Reset the BIOS. If we are talking a laptop, that means you are going to have to find the CMOS battery and take it out. This can mean some serious disassembly.

If this is a desktop, easy enough. Either take out the battery, or there will be a small jumper for clearing the cmos.