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On certain specific occasions, you may have some difficulties booting or turning your PC on. At such times, you may become irritated– justifiably so–wondering what to do, and how to start your system, to attend to your important business.
But no need to lose your calm, when such a situation greets you, out from the blue!
You can manage and successfully re-start your PC, by figuring out the problem/s reason/s behind, it and by following the advice shared hereunder.
Let’s see what could be the possible reasons!
Has Something Changed?
At first, think over the changes you may have made lately. For example, did you–in recent times–put a new hardware driver, connect a new hardware part to your system, or open your gadget’s case, and do something?

Chances may be high of your hardware driver being buggy, the new hardware being incompatible, or you unintentionally unplugging something while working inside your unit.
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Give Additional Power
In case your system isn’t booting or turning on at all– fans are not running, lights are not blinking, and nothing flashing on screen–you, perhaps, may have some sort of power problems.
What to do in such a situation?
Simple!
Unplug your gadget before you plug it directly into a wall outlet that’s working, in place of a power strip or battery backup that may be malfunctioning.
Make certain that the power switch at the back of your power supply is flipped on, and in case the outlet is properly linked to a light switch, make certain that the switch is turned on as well.
In case the problem is with your laptop, ensure that your charger is plugged in correctly, and to the right port. A power supply which is failing can, over and over again, result in boot problems, even in case the fans and the lights are working. It could be the time to change your power supply.
Is Your Monitor Working Well?

In case your computer gives a sound that shows like it’s turning on but you don’t find anything on the screen, your system, in reality, though could be booting, your monitor may not be showing it.
In such a case, check to ensure that your computer monitor is not only plugged in but turned on as well, set to the right input making use of the buttons on the bottom or side.
In case these fixes don’t work, plug in your device into a different monitor–or even a TV–and see in case Windows becomes visible. In case it happens, it means your monitor is dead, and you must make a new purchase.
Check the Hardware Inside: Are Your Components at Their Right Places?
Don’t be surprised if any specific component of your computer has become loose inside the case, particularly in case you moved it lately to a different place, or in case you attended to some business inside of the same.

In case you have no issues whatsoever opening your device up, take the side panel away, and ensure that the components–including RAM, motherboard cables, and graphics card–are appropriately placed in their individual sockets.
Explore the BIOS
In case your device starts and you see the POST screen still can’t boot into Windows, some specific settings could be creating the problem.
What to do in such a case?
Well, enter your BIOS when the POST screen surfaces, typically by pressing Delete, F2, or any different key to enter setup. In case you’ve changed any of these settings, lately, change them back. Make certain that your Boot Order is set to the proper hard drive. Ensure that not only every RAM is recognized, but that the CPU is also not overheating.
Use a Live CD & Scan for Viruses
Don’t be surprised if some mean malware is stopping your computer from booting. To tide over such a situation, boot your computer from a CD or USB drive, with a live environment. This will allow you to scan your hard drive, to detect any malware issues, minus booting into Windows.
Try any of these solutions, or a combination of these, to fix your PC’s booting problems.