Cockroaches typically live in dark and moist areas of your house.
Most roaches prefer dark, moist places to hide and breed and can be found behind refrigerators, sinks and stoves, as well as under floor drains.
If you see a cockroach or a few cockroaches then you likely have a roach infestation and need to get the roach infestation taken care of before they get too bad in your house.
Roaches also love to hide out and live in electronics such as computers, radios, televisions etc.
You should get an exterminator in to kill the roaches or use some dawn dish soap to spray the roaches directly which kills the roaches directly but doesn't get rid of the infestation.
Or you can use some fog spray to fog your home to kill the roaches or use some boric acid where the roaches are hanging out.
You might need to take electronics apart to get the roaches out using a vacuum cleaner.