Disk read error

[Guest]

Im having a problem with my Dreamcast. When I first started it up, it took me about an hour to get it to read the disk. I got it to work by putting some pressure near the back where the lid sensor is and it started up the game. After playing for about an hour, my game froze after i did a wierd button combination by mistake in a menu and I thought that the combination froze it. Now I cant get it to read games again, even doing the same thing. Ive tried holding down the lid sensor while the game is running and it doesn't get past the sega screen. Any ideas?

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