Asus P5Q w/ 16 GB of RAM?

The ASUS P5Q motherboard does not support ECC RAM like you have in your picture, which is the reason why it is failing to boot.

The board that you have supports DDR2 1200/1066/800/667 MHz RAM. After doing some research, there are a some P5Q motherboards that support 16 GB of DDR2 RAM and 8 GB of DDR3 RAM. You can easily tell if your board supports the DDR3 option by looking how many RAM slots it has. If it has 4 slots, it only supports DDR2. If it has 6 slots, it supports the DDR2 option and the DDR3 option.

ASUS P5Q Motherboard supports only DDR2 Non-ECC Memory. Recommended speed is 800 MHz as max. Supports up to 1200 MHz.

ECC Registered is not supported and will not work with P5Q.

Refer this link for compatible RAM upgrades:

http://www.memorystock.com/memory/ASUSP5QMotherboardDDR2800MHz.html