I am really sorry to know about your issue.
Let’s have a fresh start. As a best practice when building a new system, we usually suggest testing the motherboard out of case with minimum components; it could be installed on top of the cardboard in the meantime.
It is just ok (for now) if you have the motherboard already installed inside the case, we can just remove all extra components such as drives, graphics, sound card and cables from the (front panel) chassis, remember you have an onboard power button. The idea is to see if you get video directly from the motherboard with only the processor and one memory stick, remember the 2x4 power supply cable should be connected as well as 2x12.
If you still do not get video check if you get any beeps after removing the RAM, they should be three short beeps.
Regarding the red light, it is important to know which LED is red since this could indicate the specific cause for the issue. Please take a look into pages 43-44 of the Intel® DZ68BC Technical Product Specification.
The POST code display may also be of help: Desktop Boards; Port 80h POST codes
Once you get video you can start adding components, one at a time if needed.