1. Cosmos Business System

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Diamond Bar, CA

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Cosmos Business System

4.4 (12 reviews)
Closed • Closed

Services - Cosmos Business System

Laptop body repair

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7 months ago

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8 years ago

The owner is the best service in this area , they take care my computer , I will tell all my friend go there from now on

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8 years ago

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Review Highlights - Cosmos Business System

“They are are fast, reasonable and most importantly, Wendy and Kevin are nice people.”

Mentioned in 2 reviews

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People searched for IT Services & Computer Repair 3,282 times last month within 15 miles of this business.

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RossTech Solutions

RossTech Solutions

(15 reviews)

Let's start with the positives, which is how quick Earl is at responding to requests. But that's…read moreabout the only nice thing I can say here because I have very strong suspicions that I was almost taken advantage of when I saw the cost estimate. I was quoted an estimated $540.66 to upgrade my laptop's RAM and SSD. While I am fully aware that computer part prices have skyrocketed because of AI, charging $179 for a stick of 16GB DDR4 RAM and $176.66 for a 512GB SSD is pretty extreme. The only thing that is reasonable is the labor fees since a Micro Center store would charge about the same for a RAM upgrade and changing out an SSD. However, the cost estimate costing more than what my device costs seems predatory. I would have just bought a new computer for $540. I took my device to another shop called Wizfix Computers to get another quote, and the owner of WizFix said that $540 for the same upgrades is a gross overcharge. I was only charged $345 at WizFix ($225 for the same parts plus tax, $120 for labor). And as a bonus, the OS was upgraded to Windows 11. Device has been running well after the upgrades. I would have been overcharged nearly $200 if I chose Ross Tech. Trying to take advantage of someone like this to make extra money is very unethical and bad business.

I'll be honest -- handing over my MacBook to a complete stranger at my front door had me nervous at…read morefirst. But the entire experience ended up being beyond smooth and professional. I put down a 50% deposit, they ordered the part, picked up my laptop when the part arrived, repaired it fast, and even delivered it back to me at work that same day. Super convenient, great communication, and my MacBook works perfectly again. Highly recommend!

iRepair

iRepair

(549 reviews)

Free and fast diagnosis is a great feature here. Water damage in my phone broke the motherboard…read more Decided to upgrade phone, owner didn't charge at all.

Trust the 5 star reviews here. They are legit. Absolutely great experience here. My phone got that…read moredreaded white/green vertical line on the screen and needed to be replaced. I found this place on Yelp, sent a message, within a less than a minute, I got a quoted price, what time to come in and roughly how long it would take. No BS, no "we'll have to see what condition the phone is in, in order to give you the price", just exact price right on the spot. I came in at the exact appointment time, and to my surprise Jerry, the manager was there waiting for me. Dropped off the phone to him, he told me to come back in 30-45 minutes. He didn't give me any paper or receipt, so I felt a bit worried since there was no proof I left it with him but I did so anyways. Came back 45 minutes later and there was Jerry waiting for me again, showed me the phone and it was a brand new screen, worked even better than before and i was out the door in a few minutes. One of the best experiences I've ever had with repair service and definitely making this my new go to place for any repairs. I also found out Jerry not only does Phone repairs but also, tablet, and computer so I'll be coming here for those in the future. 5 stars for awesome experience here, and another 5 stars for Jerry for being friendly, easy to deal with and just providing good customer service.

Cosmos Business System - itservices - Updated October 2026

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