you sure the power pin and heat sink will fit in my hp p6226f-b computer
Are you planning on reusing your current memory modules? If you are reusing the memory modules, how many memory modules do you have and what type (i.e. DDR2 or DDR3) are they?
The only power connectors on your Pegatron M2N78-LA are:
One 24-pin ATX power connector
One 4-pin ATX power connector
Do you still require a floppy connector on the motherboard?