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!

Highlights, Specialties & Features

  • Networking, System Installation or Repair, System Maintenance and Tune Up
  • Upgrades and Software Installations

Serviced Areas

  • Los Angeles County, Orange County, Riverside County, San Bernardino County

Payment Options

  • American Express, Debit Cards, Discover, MasterCard, VISA

Contact Details

  Person Marcus or Sam
  City Covina , CA
  Zip Code 91724
  Address 461 N. Grand Ave.
  Phone Number (866) 416-3083

Business Representative

Marcus or Sam


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.

Products & Services

Virus Removal

Starting at $89 drop off, $139 on-site

Eliminate nasty unwanted items from your PC!


Starting at $139 for first 2 computers

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

$49 drop off, $139 on-site

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

$49 drop off, $139 on-site

New printer? Additional memory required? New software? We can do it!
Includes single software titles and standard hardware devices.

Drop-Off Service

Prices start at just $29!

We offer drop off service at our main office located in Covina. Call us today to schedule an appointment!

Promotions & Discounts

Discount on your first service!

Visit our web site to receive a discount on your first service!

  • Quick, and took care of my needs! Fixed the problem the FIRST time!!
  • Wish I would've known them sooner!

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 owner response:
Thank you Gerald! We appreciate your feedback! Please feel free to call us for any of your computer needs in the future!

Value for moneyTheir fees are completely reasonable!
Service & supportGreat service!!
Overall ratingExcellent

  • I would recommend this business
  • Patient and easy to understand.
  • None

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 owner response:
Thank you James! It was a pleasure serving you! Please call us any time for anything else you need.

Value for moneyFair prices.
Service & supportEasy to talk to.
QualityEverything works as it should now.
LocationOnly a couple miles from my house.
Overall ratingExcellent

Photo Book