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howtos:hardware:hardware_diagnostics [2014/01/21 20:00 (UTC)] – Added Power Button section metaschima | howtos:hardware:hardware_diagnostics [2014/06/21 17:17 (UTC)] – [Common Symptoms] metaschima | ||
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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) | + | |
+ | | ||
=== Motherboard === | === Motherboard === | ||
* Check for swollen capacitors. | * Check for swollen capacitors. | ||
Line 74: | Line 74: | ||
* 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, | + | * Problems with click-and-drag, |
* Mouse pointer jumps. | * Mouse pointer jumps. | ||
* Acceleration issues. | * Acceleration issues. | ||
Line 203: | Line 203: | ||
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 | + | Try to clean the power button using compressed air. If that doesn' |
=== 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. | ||
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=== CPU === | === CPU === | ||
If you suspect the CPU is overheating, | If you suspect the CPU is overheating, | ||
+ | < | ||
+ | If you cannot replace the CPU and it is a multi-core CPU with only one core that has failed, [[http:// | ||
+ | < | ||
+ | maxcpus=2 | ||
+ | </ | ||
+ | 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 '' | ||
+ | < | ||
+ | echo 1 > / | ||
+ | </ | ||
+ | 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. | ||
+ | </ | ||
=== Motherboard === | === Motherboard === | ||
Replace the motherboard, | Replace the motherboard, |