No, it's not recommended to jump a fan header as it can cause damage and void warranties.
No, it's not recommended to jump a fan header as it can cause damage and void warranties.
I often use affordable HP USDT PCs for various tasks. They work well with a 60mm Noctua fan in front and no rear fan. The issue is they freeze on boot and require pressing F1 because the rear fan isn't connected. I haven’t discovered a BIOS option to turn this off. Would it be possible to bypass the rear fan header using a MB pin jumper? Cheers 
The system checks the fan speed sensor to determine rotation, but disabling it could cause damage and won't solve the issue. To trick the system, you might connect a custom wire to another fan's unused port to mimic the tach signal.