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howtos:hardware:hardware_diagnostics [2014/01/21 20:00 (UTC)]
metaschima Added Power Button section
howtos:hardware:hardware_diagnostics [2014/07/31 22:43 (UTC)] (current)
metaschima [Solutions] Modified mouse section
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 === CPU === === CPU ===
   * May or may not POST.   * May or may not POST.
-  * Kernel panics are possible with multi-core machines, when only one core is affected. 
   * There may be beep codes.   * There may be beep codes.
   * The fans are typically running at 100%.   * The fans are typically running at 100%.
-  * If it is overheating it may trigger a MCE (Machine-check exception) which will cause a kernel panic and forced shutdown, or it may throttle itself down and the system will seem slower.+  * Kernel panics are seen with multi-core machines, when only one core is affected. These are clearly listed as ''Hardware Error'' MCE (Machine-check exception). 
 +  * If it is overheating it may also trigger a MCE which will cause a kernel panic and forced shutdown, or it may throttle itself down and the system will seem slower.
 === Motherboard === === Motherboard ===
   * Check for swollen capacitors.   * Check for swollen capacitors.
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   * May not open when you press the button, but instead make some clunking sounds and open only after many button presses.   * May not open when you press the button, but instead make some clunking sounds and open only after many button presses.
 === Mouse === === Mouse ===
-  * Problems with drag-and-drop, drag-and-select, double-click.+  * Problems with click-and-drag, drag-and-drop, drag-to-select, double-click.
   * Mouse pointer jumps.   * Mouse pointer jumps.
   * Acceleration issues.   * Acceleration issues.
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 Replace the PSU with a new PSU, if the symptoms disappear, you can be sure it was the PSU. However, note that a bad PSU may damage the motherboard or other components, or maybe it was a power surge that damaged everything. Replace the PSU with a new PSU, if the symptoms disappear, you can be sure it was the PSU. However, note that a bad PSU may damage the motherboard or other components, or maybe it was a power surge that damaged everything.
 === Power Button === === Power Button ===
-Replace the power button if possible, otherwise replace the case along with the button or take it to a repair shop and see what they can do.+Try to clean the power button using compressed air. If that doesn't work then replace the power button if possible, otherwise replace the case along with the button or take it to a repair shop and see what they can do.
 === CMOS battery === === CMOS battery ===
 Replace the battery carefully using the special tab. Do **NOT** pry it off using a screwdriver because then it will break and it won't go back in. Replace the battery carefully using the special tab. Do **NOT** pry it off using a screwdriver because then it will break and it won't go back in.
 +<note important>
 +Replacing the CMOS battery will reset your BIOS/UEFI settings, so be prepared for this.
 +</note>
 === HDD === === HDD ===
 You should first get your important data off of it. If you feel it is failing fast, use ddrescue to image the drive to another drive. Once you have the image, be it complete or incomplete, you can use [[http://www.cgsecurity.org/wiki/TestDisk|Testdisk]] and/or [[http://foremost.sourceforge.net/|foremost]] to carve data off the image. The data will not have the same file name it used to, but at least you will get the data. You can find all these utilites and more on the [[http://www.sysresccd.org/SystemRescueCd_Homepage|SystemRescueCD]]. Now just replace the drive. You should first get your important data off of it. If you feel it is failing fast, use ddrescue to image the drive to another drive. Once you have the image, be it complete or incomplete, you can use [[http://www.cgsecurity.org/wiki/TestDisk|Testdisk]] and/or [[http://foremost.sourceforge.net/|foremost]] to carve data off the image. The data will not have the same file name it used to, but at least you will get the data. You can find all these utilites and more on the [[http://www.sysresccd.org/SystemRescueCd_Homepage|SystemRescueCD]]. Now just replace the drive.
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 === CPU === === CPU ===
 If you suspect the CPU is overheating, then you can try to remove the heatsink-fan block according to your CPU or heatsink manual, [[http://www.howtocleananything.com/home-interior-tips/computer/how-to-clean-thermal-paste-off-cpu/|clean off the old thermal paste]], [[http://www.maximumpc.com/article/howtos/howto_install_cpu_and_apply_thermal_paste|apply new thermal paste]], or let an expert do it. Otherwise, replace the CPU. Make sure it is actually the CPU and not the RAM that is the problem, as a CPU is very expensive compared to RAM. If you suspect the CPU is overheating, then you can try to remove the heatsink-fan block according to your CPU or heatsink manual, [[http://www.howtocleananything.com/home-interior-tips/computer/how-to-clean-thermal-paste-off-cpu/|clean off the old thermal paste]], [[http://www.maximumpc.com/article/howtos/howto_install_cpu_and_apply_thermal_paste|apply new thermal paste]], or let an expert do it. Otherwise, replace the CPU. Make sure it is actually the CPU and not the RAM that is the problem, as a CPU is very expensive compared to RAM.
 +<note>
 +If you cannot replace the CPU and it is a multi-core CPU with only one core that has failed, [[http://www.linuxquestions.org/questions/showthread.php?p=5162136|for example the L1 cache of CPU core #2]], then you can try to disable the failed core. One way to do this is to use the ''maxcpus='' kernel boot option. In the example you would use:
 +<code>
 +maxcpus=2
 +</code>
 +this is because CPU cores are numbered starting with 0, so 4 cores would be numbered 0, 1, 2, 3. Note that if CPU #0 is failing, you may be out of luck. Another complementary way is to first make sure you have ''CONFIG_HOTPLUG_CPU'' built-in to the kernel, and running:
 +<code>
 +echo 1 > /sys/devices/system/cpu/cpu3/online
 +</code>
 +on every boot. In this example this turns ON CPU #3. So, basically you would have the 3 good cores running i.e. 0, 1, 3.
 +</note>
 === Motherboard === === Motherboard ===
 Replace the motherboard, and make sure the PSU is not damaged, as it can damage your new motherboard. Replace the motherboard, and make sure the PSU is not damaged, as it can damage your new motherboard.
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 Replace the drive. Replace the drive.
 === Mouse === === Mouse ===
-Although replacing the mouse is the definitive solution, some fixes may help.  +Replacing the mouse is the definitive solution. However, some fixes may help temporarily.  
-  * For click-related problems, it may be that the small plastic switch inside the mouse has worn down with repetitive use. Correcting the issue may be as simple as adding something to raise the height of the switch. One possibility is adding a small piece of duct tape over the switch to raise its height and improve its connection to the mouse button.+  * For click-related problems, opening the mouse and investigating the cause of the problem is the first step. On most mice, there are 4 screws that hold the upper and lower mouse parts together and are located underneath stick-on slippery pads. Note that after removing the stick-on pads they may be difficult or impossible to replace, so only open the mouse if the problem is truly bothersome or if you have extra stick-on pads provided with some mice.  
 +    * It may be that plastic parts inside the mouse have worn down with repetitive use. A possible fix for this is to first identify areas that have been worn down and then carefully add plastic in the form of plastic cement or superglue to replace the lost plastic. This is best done with a toothpick and must be very carefully controlled. Remove excess glue immediately and allow the rest to fully dry overnight before using the mouse. Do NOT apply glue to any area that might interfere with mouse function. This is a last resort solution, so do NOT try it until you are ready to throw the mouse out. Duct tape may be used instead for a temporary or trial solution. 
 +    * It may also be that the plastic button arch has fatigued over time and doesn't provide enough resistance to prevent inadvertent activation of the switch. A possible fix for this is adding a plastic piece under the plastic button arch to improve its resistance. Depending on the mouse, either gluing a piece of old cut credit card under the plastic button arch or inserting the credit card piece with a piece of foam sandwiched underneath into the pocket under the plastic button arch may work.
   * For wandering / jumping pointer problems, cleaning the optical / laser window on the underside of the mouse with alcohol and a q-tip may help. If it is a wireless mouse consider infrared or microwave interference depending on the wireless mouse type. Removing or isolating sources of interference or distancing oneself from the sources may help. Wireless mouse manuals recommend placing the base station away from electronic devices or other sources of electromagnetic interference.   * For wandering / jumping pointer problems, cleaning the optical / laser window on the underside of the mouse with alcohol and a q-tip may help. If it is a wireless mouse consider infrared or microwave interference depending on the wireless mouse type. Removing or isolating sources of interference or distancing oneself from the sources may help. Wireless mouse manuals recommend placing the base station away from electronic devices or other sources of electromagnetic interference.
   * For acceleration issues one can try [[https://wiki.archlinux.org/index.php/Mouse_acceleration|adjusting acceleration settings]]. However, in some cases the acceleration issues are intermittent, and may be driver issues that are much harder to solve. Trying different driver and software versions may help, or one can try to contact the developers of the drivers / software.   * For acceleration issues one can try [[https://wiki.archlinux.org/index.php/Mouse_acceleration|adjusting acceleration settings]]. However, in some cases the acceleration issues are intermittent, and may be driver issues that are much harder to solve. Trying different driver and software versions may help, or one can try to contact the developers of the drivers / software.

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