Provide: PS3 serial number (back/bottom), proof of purchase (receipt, order confirmation)
Sony options: Mail-in repair (they send box), authorized service center, or replacement (refurbished) if unrepairable
GameStop's Role
If you bought it at GameStop and it's within their return window (typically 7–30 days for new, 7 days for used), they'll exchange/refund per their policy
They do not honor Sony's 1-year manufacturer warranty—that's between you and Sony
GameStop's PRP (Product Replacement Plan) is a separate paid warranty ($10–$30 at purchase) covering accidental damage/defects for 1–2 years. If you bought PRP, file with GameStop
Out-of-Warranty
Sony-authorized repair centers (find via support site) or reputable local shops. Cost: $80–$150 typical.