blastocystosis

Thanks guys. It's hooked up directly to the TV with an atari coax adapter. When I turn it on it's just still snow. I'm not sure if it's turning on at all. I'm still new to this so how exactly do I test the voltage and all of that?

This was at a family members' house for awhile and I finally got it back here with me. I went through and got all of the dust and what not off of it. But it's still got this corrosion that I can't get off with either 70% isopropyl alcohol or Brasso. I think the motherboard may be fried but I'm not sure. It simply doesnt turn on when I hook everything up. Any help would be appreciated. Here's photos of it.