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Disassemble and assemble your computer
If your computer crashes (and freezes), or it shuts down by itself and the only way to turn it back on is to unplug it and plug it into the power cord, disassembling and reassembling your computer should help you.
If you are comfortable with disassembling your computer, shut it down, unplug it from the power cord, disconnect the monitor, keyboard, mouse and every other hardware peripheral and open the computer case.
Remove and reconnect every internal cable (SATA, IDE). Remove and reconnect all the cards inside your computer (VGA, Wireless and etc.), including the computer’s memory sticks (RAM). Double-check if you have reconnected everything before you turn on your computer. Connect all the hardware peripherals (the monitor, keyboard, mouse, speakers) and turn your computer on.
If you aren't sure how to disassemble a computer, read one of the instructions below:
Toggle the SATA controller mode in the BIOS (Basic Input−Output System)
When your computer crashes and you see one of the following stop codes: Stop 0x000000ED (UNMOUNTABLE_BOOT_VOLUME) or Stop 0x0000007B (INACCESSIBLE_BOOT_DEVICE) the NTOSKRNL is confused. Either it cannot find the rest of itself, or it cannot read the system file at the location it believes it is stored.
When troubleshooting this error, your task is to find out why the Windows kernel is confused and fix the cause of the confusion.
Check The SATA controller configuration in BIOS. If the SATA controller gets toggled from ATA to AHCI mode (or vice versa), then Windows will not be able to talk to the SATA controller because the different modes require different drivers.
Try toggling the SATA controller mode in the BIOS:
Restart (or turn on the computer) and press DEL(ETE) or F12 before the Windows Logo appears. Once the BIOS interface appears find Integrated Peripherals, press ENTER and find (PCH) Sata Control mode (or Main -> Sata Mode). Choose between IDE and AHCI combination. If one doesn't work, the other will. Save the changes by pressing F10 (which stands for Save and exit).
DO NOT MODIFY BIOS ON YOUR OWN, UNLESS YOU KNOW WHAT YOU ARE DOING.
Note: You can reset the BIOS, either by carefully removing the battery on the motherboard or in the BIOS menu by pressing Setup defaults; Fail-safe defaults or Optimized defaults (F9 or F6 or F7).
Change the RAID settings back to "Autodetect" (If available)
When your computer crashes and you see one of the following lines: Stop 0x000000ED (UNMOUNTABLE_BOOT_VOLUME) or Stop 0x0000007B (INACCESSIBLE_BOOT_DEVICE) the NTOSKRNL is confused. Either it cannot find the rest of itself, or it cannot read the file system at the location it believes it is stored.
When troubleshooting this error, your task is to find out why Kernel is confused and fix the issue.
This error might be an outcome of your unsuccessful experiment with the RAID controller settings.
Try changing the RAID settings back to Autodetect (Usually Dell computers/laptops have this option). To do that, restart (or turn on the computer) and press DEL(ETE) or F12 before the Windows Logo appears to access the BIOS menu. Once it opens, highlight Drivers list and then SATA operation. Select RAID Autodetect (/ATA) and apply the changes (restart the computer).
Note: DO NOT MODIFY BIOS ON YOUR OWN, UNLESS YOU KNOW WHAT YOU ARE DOING, because you may cause additional problems.
Dalvik is the java based Virtual Machine (VM) that runs Android apps on Android. Dalvik-cache is the cache area for Dalvik VM, which is created when the Dalvik VM optimizes your application for running. Dalvik cache only poses a problem, when you often install and uninstall different applications.
You can clear the Dalvik cache only if your device is rooted. Click here to read more about rooting.
Find a root explorer application (eg. ES File Explorer in Google Play Store)
Enable the root directory
In ES File Explorer go to Menu -> Settings
Check Up to Root then below check Root Explorer. Accept any Superuser requests
Go to /data/dalvik cache, select all files in the folder and delete them
Reboot the device After reboot, system will reoptimize to the changes you made
Note: If you are not 100% sure, don't do this on your own, and be very careful what you delete.
A computer might crash if it can't handle the software, the game, or a set of tasks you are trying to run on it (the CPU, RAM or other component isn't strong enough).
From time to time (usually after two years of use), you should consider upgrading your computer's hardware such as the CPU (Processor), RAM, Hard Drive etc.
If you are using an old hardware it will be almost impossible to browse the net with a good speed, watch a movie and install new programs and etc. because developers create new websites and programs which consume more memory and which work properly only on computers that have the latest or not-too-old hardware components installed.