It may be time for a new power supply if your computer keeps shutting down at random times, or gets hot very quickly, you may want to act fast in order to keep from your computer crashing.
Yes get a replacement as it could damage other parts of your system
A faulty power supply does not supply any power at all to a computer or supplies incorrect voltages. Most of the time faulty power supplies are not serviceable and require replacement.
Either a dead battery - or a faulty power supply.
Voltage settings on the back of the power supply should be checked
any power supply with at least 175 watts
Computer not booting
You should not bother to check any power supply in the motherboard. You need to take the motherboard to service centre if faulty.
When your computer will not power on. When the cooling fan of the power supply has failed. When the amount of hardware in use in your case exceeds the power capability of your power supply.
Remove and replace the power supply.
Yes, it can be faulty. Some damaged power supplies show good output voltages on the voltage range of a multimeter but, when you connect them, they don't work properly. One possible reason is that maybe an IC in its voltage regulator has a high resistance between the common and the output. You cannot see this by shunting a voltmeter onto it. You have to place a typical load onto the output to test it.
It is not recommended to replace a 350 watt power supply with a 300 watt power supply, as the lower wattage may not provide enough power for your components. It's best to match or exceed the wattage of the original power supply to ensure proper functionality of your system.
Either faulty power supply or faulty wiring, the latter of which can either be hot or ground.