These boards generally do not support 4th Gen (Haswell) or newer Intel processors.
After conducting research, I found that the HP D33D66 motherboard is a relatively older motherboard model from HP, likely used in their commercial or enterprise desktops. hp d33d66 motherboard
2 to 4 slots supporting DDR3 (some variants may list DDR2 in error, but LGA 1155 typically uses DDR3). These boards generally do not support 4th Gen
(note: some listings show newer CPUs like i5-6500, but these use different sockets like LGA 1151). Memory (RAM) 4 DIMM slots (usually), supports Non-ECC (1333/1600 MHz). Max capacity usually 32GB. hp d33d66 motherboard
If the power LED blinks red 5 times, then repeats, the board is signaling a "Pre-VGA" or general system board failure. This is often caused by: