is it under warranty?
i have a 4540s, build quality is good no heating issues so far.... though startup feels a bit slow. Since mine is metal body, u will feel a slight tingling sensation when u touch it (just like when u touch the side of refrigerator :P)
i am not sure but i think being an older model and used one, the price is bit high.. I bought mine brand new last year for 68k (which is now for around 60k) its the one with 2gb dedicated graphics model