The Intel Core i5-7400 is a desktop processor with 4 cores, launched in January 2017. It is part of the Core i5 lineup, using the Kaby Lake architecture with Socket 1151. Core i5-7400 has 6MB of L3 cache and operates at 3 GHz by default, but can boost up to 3.5 GHz, depending on the workload.
You'll need to give us a bit more here! Make and model of the computer for starters!
How about a bit more on what happened too!
por Dan