Fix Fault Lenovo

lenovo sff on pressing start -the front fan revs to very high speed -and will not start can anyone name problem?

i have a Dell (small case) 980 optiplex pc -want to fit a dvd burner. i have a spare one from my Lenovo thinkcentre (small case) dual core -old pc -think cables are sata also one from an old dell pc ... more

how to inlock my computer? its lenovo brand