PS2 modchip?

I went to goodwill tonight and found a cheap ps2(fat) and I figured I pick it up so I could open it and play with modding it. I plugged it in and it didn't turn on, bummer, so I opened it and noticed a bunch of screws were missing. And it had no cable going from the the board to the power switch, that explains the power problem.
I took apart the whole system and found this:

http://i.imgur.com/cStt3zD.jpg

Any idea what I'm looking at?

Thanks in advance,
- John

 

yes, its a modchip. A DMS4 lite.

 

Another problem has arisen. I'm not sure the model, but there's no ribbon going to the reset/eject buttons. They're directly on the cd tray. I reseated everything and still no power. I found what could be a blown fuse.
http://imgur.com/YouIr62

Could this be my problem? Thanks again,
- John

 

Awesome, thanks. That chip any good? I got a modbo coming soon.

 

Fuse does look blown. That chip is good. It uses the toxic bios. you can compare features to the modbo (which uses matrix infinty fw):
http://sksapps.com/index.php?page=dms4.html
http://sksapps.com/index.php?page=matrix.html

 

If you don't have the power eject ribbon connected to the motherboard it won't turn on period. I don't know what you mean by directly on CD tray.?

 

This model PS2 doesn't have the reset/eject buttons on the outer case. They're on the cd tray. There's no ribbon because they're not separate. It's the SCPH-50001 model.

 

I replaced the fuse and now it powers on fine, but it won't read discs. I made a new thread over in "repair/restoration".

Thanks for the help!