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It is difficult to distinguish between repair online companies and know which one is legit. Quick fix software, registry repair, and optimizing software is not legit. There should always be a human input when diagnosing a computer system.
Some computer faults are impossible to diagnose online or even remotely. This is what happens when there is a problem on the motherboard. I don’t know of any software that would identify a faulty capacitor on the motherboard or the overheating of the South Bridge or North Bridge. The temperature of some places can be measured with a CPU ID Hardware Monitor.
But, this will not show the temperature of any MOSFET’s. Furthermore, no software will tell you that the power supply is faulty. There is a software from Eurosoft QA+Win that claims to show the computer system state in full. This is a diagnostic software and costs $359. However, I have found that this specific software gives diagnostics which are not always correct. In fact, I have used it a couple of times and it gave me incorrect answers. But, in order to make a decision, it would depend need on a lot of diagnostics. According to statistics, you need 1000 experiments to get the needed data, so of course my two experiments are not enough.
Some companies have a facility to book the repair online. Or they have a contact number to call them and get quote, send the computer, and receive it back, fixed. . some companies charge a fixed rate for laptop computer repair. Other companies will offer a quote first. This is especially common for Apple computer repair. To repair Apple computers, there is always a higher cost. The company that I mentioned previously on this site, Cocotec, does fixed cost repair and the cost is also the same for Macs. Though, Cocotec does not have repair management online ability.
Online desktop computer repair includes fewer companies because it is inconvenient to send the desktop out for repair. Desktop computers are usually fixed locally.
Data backup is important. Even if the computer is still running, but needs to be fixed, do a complete data backup and then double check that you have all the necessary data.
Sometimes, data gets lost, not because the company or engineer did something wrong, but because the customer forgot that there is very important data on the computer and the hard drive had to get formatted. After a format, it is very difficult to get data. If you are lucky, then you can get most the data after a format, and if not, take it as a lesson for the future.
Hire a company with a good reputation. A company that has facilities near you is always better.
Online forums can help you with this and they can find a good company near you. I would recommend Cocotec if you are in the UK. They are based in Birmingham.
ACI is also good at fixing laptops.
And, ACI does trade repairs.
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Me holding a laptop hard drive