MKSK

Is it necessary that if the fault is in the PSU then it's temperature should be high? I asked this because I have used my PSU again in my PC. It booted properly but restarted while loading windows. I tried starting it again and windiws loaded successfully. Then I played Batman Arkham city for 4 hours without any problem. After that I checked the temp of the PSU by touching it and it was OK (not very high). I also did a stress test using Everest software for one hour. Again the PSU worked fine without any problem. I thought under full load the PSU will die but it worked like a magic. If there was a problem in some other component I don't think the PC would have lasted more than 30 minutes. The next day when I started the PC it hanged while playing a casual game for 15 minutes. After a hard reset it refused to boot. After trying severel times it finally started and worked fine for the whole day. I am sure its the fault of the PSU. Though it is trying to stay alive but that won't work for longer. I am going to buy a new PSU and will let you know how it works. Thanks

I would like to mention one more thing which I didn't notice that day when I was reporting the voltages of my old PSU from the BIOS. I also used ASUS PC Probe software to monitor the voltages. It showed an alert message which I didn't notice because the PC automatically got restarted. Today my PC started successfully using 250W PSU and I was just going through some settings in ASUS PC Probe software and I found this ALERT MESSAGE - "[09/13/2013 at 08:04 pm] +5V Voltage Abnormal, 0.00 V" & "[09/13/2013 at 08:04 pm] +5V Voltage become normal, 5.20 V". May be this should make it pretty sure that the problem is with PSU. What do you think?

So should I buy a new PSU? If yes then can you help me in selecting a good one ?

I have Sapphire HD 6450 2GB DDR3 graphic card. I have switched to this graphic card now. After placing the ram the system has booted and windows has loaded successfully. Though the windows has loaded successfully I don't think my pc is stable. while I was trying to launch one of the software the software launched but it gave an error "Access violation at address 0041E69B in moduls. read of address 00000100."

I did as you asked and removed the RAM. I didn't remove the graphic card as it is not easy for me to put it back but in the BIOS I selected the onboard graphics and used it. After starting the PC I didn't see anything on the screen but the PC kept beeping until I switched it off.

I have swaped my PSU with an i-ball 250 watt PSU( it was the only PSU available for testing). When I started the PC it booted properly. It was working fine until I restarted it. The BIOS booted but after that there was a black screen with a blinking cursor on the top. When I restarted the PC the bios didn't boot. I didn't find any changes after changing the PSU. May be because the PSU is of low wattage of 250 or maybe there is a fault in some other component . I am confused here. Please help.

O.K. Thanks for the link. May be if I get the multi meter or voltmeter from my friends I'll try that too. Right now I have just reported these voltages from the BIOS- 3.3v is 3.312, 5v is 5.222 and 12v is 12.302. Let me know if this gives you any idea.

Yes I can borrow from one of my friend but that will take time. Till then can you tell me what are the stable voltage ranges for 5v, 3.3v and 12v. I'll check the voltage ranges from the BIOS or from the ASUS PC Probe software and also let you know whether changing the PSU has solved my problem. Thanks again.

Yes, my date and time were correct. I also checked by removing the CMOS BATTERY . After replacing it the bios asked to setup the time. After saving the time the battery works fine but the problem still exist.

Tested hardisk with Seatools Thanks to both of you for replying. I have tested my hard disk with "Seatools for windows " and ran all the tests except the 'long' ones.All the tests were successful. I would like to mention one more strange thing that happened just few minutes from now. I intentionally turned off my PC and then turned it on again. It didn't boot. I switched it off again and waited for some seconds and then again turned it on. It booted and the bios showed an error "overclocking failed or overvoltage failed". Even though I have not overclocked anything it shows this error .Does that conclude that it is the fault of my PSU? PLEASE DO REPLY.

Hi, I am new to this forum. My problem is My PC works fine when I am playing 3D HD Games or converting some video files or using any normal software but when I shut it down and start it after some couple of hours may be 6 to 9 hours it doesn't boot . Then I try to Start it again and it boots and hangs while windows is loading. After trying to start it 4 to 5 times it finally gets started and then again it works fine. This cycle is repeated everyday. I have also re-installed my windows so that I can be sure that it is not a software problem but the problem still exist. I have also tested RAM with windows memory diagnostic tools in windows 7 and it was successful. Also tested Hard Drive and it worked fine. So, Now I think it's PSU's fault but I am not sure. Also I have not overclocked anything. Please Help. My PCs Specs: Intel Pentium dual core E5700, Kingston 2x2GB DDR3 RAM, Seagate 500GB hard disk, ASUS P5G41CM-LX Motherboard, Sapphire HD 6450 2GB DDR3 Graphic card, Xtech 550W PSU.