Typically, it is very safe. Remember these people are professionals with integrity they must maintain. If someone were to steal your hardware, your data, etc… This would put them out of business essentially.

Age and Specs: A computer that's relatively new or has high specifications might be worth repairing. If your system meets your needs and the issue is fixable (like replacing a hard drive or upgrading RAM), repairs can extend its life at a fraction of the cost of a new machine.

Do computers need servicing? The short answer to whether computers need servicing is “yes”. You have your car serviced regularly because you know that regular maintenance keeps it running smoothly and prolongs its useful life. In the same way, regularly servicing your computer will ensure its long-term health.