System shutting down without any warning

hi

My system keeps shutting down without any warning. It completely powers down(sometimes the keyboard lights are still on). I am unable to switch it on using the power button but once i switch off the SMPS and switch it on again I am able to start the system using the power button

I checked the cooling fans and everything seems to be fine.

I would appreciate some help in this matter.

Regards
satish
sat2004Asked:
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buckeyes33Connect With a Mentor Commented:
I think that I would check the power supply first thing. You can do this by just swapping it out with a friends.

can you list your system here so we can help you more?
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CallandorConnect With a Mentor Commented:
You can also try to lower the power requirements by stripping it down and disconnecting unnecessary peripherals.  In the long run, you'll need a decent power supply (and I know somebody who has a recommendation).
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buckeyes33Commented:
>>and I know somebody who has a recommendation).
lol, I take it you want me to recommend an Enermax?

here these are good.  


http://www.futurepowerpc.com/scripts/details.asp?PRDCODE=PSEN-EG365PFC


http://www.futurepowerpc.com/scripts/details.asp?PRDCODE=PSEN-EG465PFC

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CallandorCommented:
buckeyes33,

I knew you were waiting in the wings for an opening, but you really didn't need to list it twice ;-)
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CallandorCommented:
Oops! - sorry, didn't see the different power ratings - optical illusion on my old eyes.
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mrcicpCommented:
Hi there Satish,
   Basically you are looking at a power supply problem or an overheating problem generally.  As has been recommended, change your power supply first and see how it reacts, its difficult to know without knowing what your system is exactly but if you get yourself a good 350W power supply it should handle your system fine unless you have a crazy beast of a PC :P  If you list your specs and your Power supply wattage rating we will be able to tell you if you have enough juice to run it (if you do then you may just be looking at a knackered PSU)
  What you could be looking at if this doesn't solve your problem is a heat issue.  Most people look at the CPU fan and see that its working properly to check their heating issues but it can be more complicated than that.  
   Things that can be overheating:
                                       CPU (check your Bios and/or hardware monitoring program if you have one to check temp)
                                       Graphics card  (check the GPU fan and if your computer regularly shuts down during gameplaying this could be your problem)
                                       Memory bus (a section of the motherboard, just put your hand close to, but not touching, your motherboard to test the temp, you can fit a fan directly above the hot-spot if you have a serious heat source)
                                       Hard drives (a customer of mine had a simlilar problem and fitted several system and expensive Volcano CPU fans before he realised that his hard drive was in direct contact with its metal supports and was overheating.  If your hard drive gets very hot at shut down times, put home made risers in to increase air flow around the drive, move it to a slot nearer a system fan or get a hard drive cooler)
   If its not a heat issue then there is a chance it could be a software/driver problem but this is a very unlikely cause of your random shut downs as it would generally be obvious that something in Windows was causing it.  It would help if you could give a brief description of your PC set-up (as much as you know) and let us know when your shutdowns occur and how often.  
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buckeyes33Commented:
points split.
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