Cannot locate my Power Supply Unit. Please help?

Honey33

Reputable
Sep 20, 2014
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4,510
Okay, so I'm new to very many aspect of trying to build and customize a PC. I'm trying to locate my PSU so I can replace it to try and solve that annoying Kernel Power Error 41. But when I opened it up, I'm looking for a box with plenty of cables running from it with a fan, and when I look in, I don't see it.
When I open it up, all I see is the motherboard, a fan, a fold-out CD-Rom drive, and behind it, my graphics card. So can someone point out where is my PSU?

Picture taken of my computer's inside layout (Used a link since the picture came out with a huge res)

Just a small note, this was a Best Buy bought computer since I don't really know enough to reliably build my own computer. So if there's something silly you see, that's a best buy thing I guess. :p