Although the CPU is the brains of a laptop and the hard drive is its long-term memory, the motherboard could very well be the most important component because it allows everything to communicate with each other. Essentially, it brings it all together, which means that when there's a problem with it you're going to have to have it replaced. Unfortunately, it's one of the hardest things to replace because it's nestled so deeply within the computer itself. At least buying a replacement eMachines laptop motherboard is easy enough though. If you're reasonably sure that the motherboard is the problem, buy the replacement online, install it or have it installed, and see if that remedies the situation.
Try to make sure that the motherboard is actually the problem first. It can be difficult determining that your motherboard is at fault though because so many other components are connected to it. One thing you might want to try doing is disconnecting the various components to see what happens. If the motherboard is at fault, the problem will still show up no matter what's connected to it. You might also have a suspicion that the motherboard is the culprit if a power surge preceded the issues you're noticing. Power surges are often implicated in damaged motherboards, and you'll most likely need a replacement eMachines laptop motherboard if that is what caused the damage.
Unfortunately, a brand new motherboard might end up being prohibitively expensive. Manufacturers tend to charge a premium on brand new parts because that often forces people to buy brand new laptops instead. Thankfully, you can buy a used eMachines laptop motherboard online for cheap. People often sell their used laptops online on sites that specialize in those kinds of sales after they experience a small problem with them. The motherboard inside the machine might be just fine though. In the end, you could get access to a used part that's just as good as new but that costs a fraction of what a new part costs. Since your laptop is used too, why not get a used part to fix it up? Once you install it, you'll probably never know the difference, especially since a motherboard is buried so deep within your computer anyway. The important thing is that your laptop will be functioning properly again.
The easy part is buying the replacement eMachines laptop motherboard; the hard part is going to be installing it. You could try doing it yourself if you've got experience working with computers, but just be sure to diagram or take pictures of everything you do so you can put the laptop back together again. Alternatively, you may want to see if a friend with more experience than you would be willing to do it. If you don't know anyone that would be willing to try, you might want to contact experienced troubleshooting professionals to see if they'll charge a reasonable fee to install it. Since you'll already have the replacement eMachines laptop motherboard, you'd probably end up paying less than you regularly would. In any case, once it's finally installed your laptop will finally be able to function normally again.
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