I'm using the coolermaster model [RS-380-PMSR / RS-380-PMSP] 380W. my computer wont turn on after the first attempt to power it up, but after some succesive pushing of the power button and leaving it for about 10 minutes before pushing the power button again it starts working
Sound like 'classic' failing capacitor symptoms to me... RMA the power supply if you're able to, start scraping together some cash for either a rebuild (replace capacitors) if you can't OR purchase a NEW PSU
Once you get the system running... I would recommend you leave it turned on 24/7 as this will keep the failing capacitors at a static temperature (instead of the heating/cooling cycle) thus milking the last bit off life out of it while you secure a replacement unit.
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There are lots of ATX power supplies on the market. You do not need to use a HP 300 watt power supply. Just purchase one that suit your requirements - 300 watt or more. These power supplies have standard mounting holes.
1 or 2 extra hdds and ram does not require much extra power and your coolmaster should do the job. But if you intend to use a newer graphic card you should check the requirenments for wattage at your new card manufacturer product specification webpage. I am pretty sure that almost all newer graphic cards require at least 500 watt to run without problem. My advise is to buy at least a 550 watt psu although i don't know what is your hardware. Try to post your hardware specs and calculate for each component (cpu wattage+graphics wattage +etc) your power supply need to be over 50 wattage. Hope that helped!
Stop beating up the tower before you damage the harddisk! If the case/PSU is out of warranty, take the PSU out and get the fan replaced. You can do it yourself, just observe the arrow direction on the fan (usually the round label should point out) and wire colors (the fan should blow out). Observe also all the precautions since the capacitors inside can hold a significant charge.
OK most PSU's are the same.. by that I mean as long as the output & connections match, then the size & shape don't really matter.
On the PSU somewhere will be a "Wattage" rating say 250Watt... whatever.. simply obtain a standard (Usually 350Watt) PC Power Supply Unit (PSU)of the SAME or HIGHER Wattage rating & also ensuring the Mating Connector onto the MotherBoard is the same... ya be all good..