Cannot Get To BIOS Setup

Dell Precision T8510

I cannot enter the BIOS setup of my system.

1. Powered up the PC, waited and pressed the F2 key as soon as the first light showed on the keyboard. PC will not boot up. The power is heard running almost forever.

2. Powered up the PC, waited and pressed the F12 (for boot sequence) key as soon as the first light showed on the keyboard. PC will not boot up. The power is heard running almost forever.

3. I installed a new PCIe drive I cannot see in Computer Management, so I need to check the BIOS, ubt I can't.

Thanks.