Overheated, or really broken?

that was summer, but it wasnt that hot...we're playing with my ps2, but then of a sudden turned off...we quickly checked it, then it smelled like burning plastics, or sumthing. it turned on again, but this time, cant read the cd...it just left a round scratch on my cd near the center..seems like it was scratched while running, and it hapend on other cd's too...

my ps2 starts, but doesnt recognize my games now than it usually does...

now we repaired it to a tchnician...

i just wana ask if i could stil fix that one on my own, rather than spending money for its repairs...

thnx..