What is the Power Supply?\r\n\r\n\tIt is the metal box located inside the PC case that provides the power to the whole computer so it can operate, also called the\u00a0PSU.\r\n\tIt has a fan inside of it to cool down its electrical components in order to function normally.\r\n\tWhen you connect the power cord to the PC back side you are basically connecting it to the input power socket of the Power Supply.\r\n\r\nHow does the Power Supply work?\r\n\r\n\tThe power supply converts the national AC power (110v or 240 v) into several DC outputs that the computer components require to operate.\r\n\tIt's providing the Motherboard with the 3.3 v, the\u00a0Hard disk,\u00a0CD\/DVD room drive and other devices like\u00a0fans with 12 v, and also it provides the computer case with 5 v so that you can start booting up the PC when you press the on\/off button or restarting it by pressing the small restart button or it can handle the standby mode when its required.\r\n\tThe Power supply also deals with the operating system, as it receives and sends signals for different purposes like controlling the stand-by mode, recieving trigger signals to shutdown or restart the computer ...etc.\r\n\tSome Power Supplies provide AC output socket to connect the monitor power cable instead of connecting it to the wall power outlet.\r\n\r\n\r\nHow many types of Power Supply are there?\r\nIn terms of technology, there are two types of them:\r\n\r\n\tAT Power Supply: It represents the old type of Power Supplies were the power cables connectivity that connects the On\/Off switch on the front side of the PC case to the Power Supply directly, I believe that no one is using this type anymore because it is working with old types of computer cases.\r\n\tATX Power Supply: Represents the newer technology which connects the power cords from the Power supply to the On\/Off switch through the Main-board, this technology provides more reliability and functionality to the power system as a whole.\r\n\r\nWhat should I know before buying a new Power Supply?\r\nYou have to put in mind the below points:\r\n\r\n\tPower value (The biggest watt value the better PC performance): The\u00a0Power Suppliers measured in Watts (W), there are several types of them in terms of Power value like 200 w,250 w, 300 w, 350 w, 400 w, 450 w, 500 w, 550 w, 600 w, 650 w, 700 w, 750 w, 800 w \u00a0and 850 w, hence this might be increased in the future.\r\n\r\n Note: The power value in Watt (W) is the result of multiplying the Voltage (V) value by the Current value in Amperes (A) \r\n\r\n\r\n\r\n\tBrand name (The better brand Tier the better life time and reliability): There \u00a0are many Power Supply brands out there which is valued as Tier such as Tier 1, Tier Z, Tier 2, Tier T, Tier 3, Tier 4 and Tier 5; Tier 1 is the\u00a0most powerful and stable components on the market hence Tier 5 is the lease valued ones and are not recommended.\r\n\r\n \r\n\r\nNote: Tiers consists of scores given to each Power Supply's performance in terms of\u00a0rail stability,\u00a0ripple,\u00a0efficiency, and\u00a0silence.\r\n\r\nHere are some good brands to chose from:\r\n\r\n\tEnermax Galaxy\r\n\tPCP&C TurboCool\r\n\tPCP&C Silencer\r\n\tZippy\/Emacs SSL\r\n\tZippy\/Emacs GSM\r\n\tZippy\/Emacs PSL\r\n\tSilverstone ZF (Etasis 85\/75\/56)\r\n\tSeventeam ST\r\n\tSilverstone OP\/DA\r\n\tZippy\/Emacs HG2\r\n\tZippy\/Emacs HP2\r\n\r\nBut you should remember that there are many others out there in the market.\r\n\r\n \r\n\r\n\r\n\tType of power cord jacks: Knowing what types of power jacks your internal components are using is one of the main points that you should take in confederation to purchase the correct Power Supply for your computer, as there are a couple of types like\u00a0SATA,\u00a0PCI ...etc also the mother-board power socket type.\r\n\r\n Note: Newer Power Suppliers provide many different types of power jacks. \r\n\r\n\r\n\r\n\tCondition of\u00a0Rails: Ensure that the smaller branch circuit wires are well manufactured, bad manufactured rails increase the overheat as current is passing through them.\r\n\tThe Warranty: Compare each manufacturer's (guarantee, return policy, and customer service) history. There are some\u00a0PSU manufacturers that release great products with horrible support, and vice versa.\r\n\r\n\tType of AC Power cables: Ensure that the Power Supply has the power plug of three pins instead and\/or in addition to the two pins one because its better to earth the power supply to the wall face plate.\r\n\r\n\r\nWhat are the common Power Supply problems and their symptoms?\r\nThere are many problems that the Power Supply might cause to your computer such as:\r\n\r\n\tThe Power Supply is not functioning for no reason.\r\n\tThe Power Supply fan has weakness in performance or stopped working.\r\n\tThe computer is making restarts for no reason several times during the day.\r\n\tThe computer is being powered off when using the\u00a0CD\/DVD drive or an external device that connected to a\u00a0USB port.\r\n\tThe Power Supply is providing more heat to the PC case.\r\n\tBuzzing sounds coming from the Power Supply.\r\n\r\nWhen one of more of the above mentioned symptoms is hapening with you:\r\n\r\n\tYou may try to blow the power supply by an air blower after opening the computer case (in case of dusty components are inside which sometimes cause the in-functionality)\r\n\tOtherwise if the blowing did not solve the problem you should purchase a new PSU and replace it with the current one.\r\n\r\n Note: Do not open the Power Supply Unit box to see its electrical circuits as it contain capacitors that store the voltage charges even if the computer is turned off or the power cord is not connected to it and exposing to this charge might cause a real injury to the user. \r\n\r\n If you like this article you may\u00a0Rate it from above,\u00a0Share it from below,\u00a0Post your comments from here. \r\n\r\nYou might also like to read:\r\n\r\nHow to Upgrade my PC?\r\n\r\nHow to buy the Best PC?\r\n\r\nHow to deal with my CPU overheating?