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Expert Reaction, Inc. Expert Reaction, Inc. has been serving both residential and corporate offices since 2006. Our technicians have minimum 10 years experience. We offer the quickest most accurate repairs in the industry so you can get your life and/or business back on track.

If you have any issue with your computer, we can help!

We offer flat rate pricing on on-site and in-office service by appointment. Please call today to get a quote over the phone!
Served areas
  • Los Angeles County, Orange County, Riverside County, San Bernardino County
Highlights and features
  • Networking, System Installation or Repair, System Maintenance and Tune Up
  • Upgrades and Software Installations
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Services
Virus Removal
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Eliminate nasty unwanted items from your PC!
Networking
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Wired or wireless, complex or simple. We can handle it!
Includes wireless encryption, network card installation if necessary, workgroup configuration, printer and file sharing. Windows Server, Mac OS, Printers, Print Servers. we can make it all co-exist!
System Maintenance and Tune Up
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Running slow? Minor error? Your system will be in top shape when we're done!
Includes temp file clean up, startup optimizations, optimized windows settings, etc.
Upgrades and Installations
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New printer? Additional memory required? New software? We can do it!
Includes single software titles and standard hardware devices.
Drop-Off Service
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We offer drop off service at our main office located in Covina. Call us today to schedule an appointment!
People
Marcus or Sam
Co-Owners
Expert Reaction, Inc. was founded in the summer of 2006 between two friends working in the IT field as computer technicians. With business and management experiences, Expert Reaction situates on a strong foundation to provide quick and reliable services to both residential and corporate offices.
Photos
Our Offices
We Build Custom Computers!
Reviews (7)
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Jose Fernandez Iii
Dec 24, 2021
Years ago I had a very positive experience with Marcus of Expert Reaction. Recently I had an issue with another computer. I attempted to fix the issue myself. I wasted lots of time googling how to and even bought "fix it" software that did not help. I called on Expert Reaction again. This time around I had the pleasure of working with Sam. We made an appointment but I requested that if they could "squeeze me in" sooner, please do.

They tried but, I was unavailable at the time that time. Sam took us in right on time. He was friendly, knowledgeable, and most certainly an expert. He fixed my computer issue and made a few tweaks to it that will make my life easier. The fee for the repair was more than reasonable. I couldn't be happier.
Ken Flint
Jun 11, 2021
Best small business IT service and consultants I know. which I'd why we stick with them year after year. They know their stuff and always respond well to my question or needs.
Martin Gandara
May 19, 2021
I went to expert reaction with a problem on my pc. I downloaded a bad bios update. They said they would fix it for $89. I say it was worth it and they answered all of my questions.
Lee Millsaps
Mar 10, 2017
I have worked with Expert Reaction for many years. They know their stuff, are quick to react to problems, and get the job done right! I highly recommend them!
Donald Odom
Nov 29, 2016
Friendly and prompt service, completely professional. Marcus and Sam are the best for the job and always come through with everything I ask of them! Highly recommended by me!
Gerald Shin
Apr 08, 2011
I've had several computer "geeks" come to my office in which I spent over $1,000 of repairs and services that was NEVER RESOLVED! So I tried my luck and went online and searched for local computer repair shops and Expert Reaction came up.

WOW! These guys are incredibly friendly, and they were straight forward and upfront about their prices!

They are very professional and they REPAIRED my system without spending a ton of money! My service costed $188 which I feel was MUCH more reasonable than other companies that charges on an hourly rate! They were on time, and they were very communicative!
Business response
Thank you Gerald! We appreciate your feedback! Please feel free to call us for any of your computer needs in the future!
James
Apr 05, 2011
I dropped my laptop off because it was running slow. I received a call an hour later with a complete diagnostic and a couple of recommendations. They were very helpful with helping me understand what was going on and very patient, as I am a "novice." They completed the work I requested and the bill was exactly what they said it would be! Thanks!
Business response
Thank you James! It was a pleasure serving you! Please call us any time for anything else you need.