Great Computer Systems, Inc

Chicago Network Repairs

Established in 1996, GCS has been providing computer networking services, Data Backup (on site and off-site), Business Continuity and Disaster Recovery solutions, Telephone Systems Installation and management, Voice and Data cabling. We are Microsoft Gold Partner, Digium, and Dell Partner. We manage your IT so that you can manage your business.

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GCS - Chicago Network Consultants, Computer Consulting Services serving Chicago since 1996

We are your one stop solution for your computer, network management, security analysis, data backup and recovery, business continuity solutions and telephone services. If you are looking to secure network, on-site computer repair, data recovery, set up new hardware or software, phone system support or protecting your business, you have come to the right place! Call us today to find the perfect solution for all your information technology needs!

Networking Services Chicago

Network Services

We are leader in networking for personal and small to mid size businesses. We assure you prompt, professional treatment and guarantee successful completion of your project.

Computer Repair Chicago

Network Services

Let one of our experienced engineers look at your computer or laptop today! We can provide you on-site computer service with a complete diagnostic evaluation and discuss all available options.

Business Backup Solutions Chicago

Network Services

Prevent data loss with our great deals on data backup. In addition to standard data recovery, we have a state of the art data backup and recovery solution that "bullet proofs" your data.

Phone Services Chicago

Network Services

GCS is your one stop shop for buying, installing, and servicing telephone setup for your small business. We sell, install, and service telephone equipment of the highest quality. We install voice and data cables


Call GCS

We serve Chicago and Chicago suburbs in IL since 1996 including:

  • Oak Park
  • River Forest
  • Maywood
  • Bellwood
  • Hillside
  • Berkely
  • Melrose Park
  • Stone Park
  • Northlake
  • Elmwood Park
  • River Grove
  • Franklin Park
  • Bensenville
  • Harwood Heights
  • Norridge
  • Shiller Park
  • Rosemont
  • Park Ridge
  • Des Plaines
  • Niles
  • Mount Prospect
  • Prospect Heights
  • Arlington Heights
  • Rolling Meadows
  • Schaumburg
  • Elk Grove Village
  • Hoffman Estates
  • Palatine
  • Lincolnwood
  • Evanston
  • Skokie
  • Wilmette
  • Winnetka
  • Northfield
  • Morton Grove
  • Glenview
  • Northbrook
  • Wheeling
  • Buffalo Grove
  • Deerfield
  • Highland Park
  • Highwood
  • Lake Forest
  • Lincolnshire
  • Long Grove
  • Lake Zurich