STM32F4 Shorting Out
The minimum circuitry for an STM32F4 includes:
- NRST pull-up.
- BOOT0 pull-down.
- Decoupling capacitor for each power pair.
- Vcap.
- Vbat.  

Also. Why is Vcap connected to Vbat and Vref? You're shorting the internal regulator?

You have seen this image, right?