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Old 18-03-2011, 05:16 PM   #1 (permalink)
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Default System turns off all of a sudden

Hi
My problem is that the system turns off all of a sudden. When I press the On button it doesnot start. I have to turn off the UPS and turn it on again. Then if I press the on button it starts.
What could be the problem?

OS windows 7. Config: Intel Core 2 Quad 8400 @ 2.66 GHz./ 2 GB RAM./ Nvidia gforce 9400 / Power supply: Model XS-300FB/ UPS: APC 600VA
Last edited by Aanand; 18-03-2011 at 06:37 PM. Reason: missing information
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Old 18-03-2011, 05:55 PM   #2 (permalink)
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Default Re: System turns off all of a sudden
^^
and the Power Supply..?
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Old 18-03-2011, 06:34 PM   #3 (permalink)
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Default Re: System turns off all of a sudden
Power supply: XS-300FB
Size PS2 Single

Input Voltage 230 V

Connectors Mother Board Connector 20+4 Pins - 1
Core Voltage Connector 4 Pins - 1
SATA Power Connector - 2
4 Pin Power Connector - 3
FDD Power Connector . - 1


Voltage
Ampere Rating
Voltage Amperage
+3.3 V - 11.0A
+5 V - 13.0A
+12 V - 9.0A
-5 V - 0.5A
+5 VSB - 1.5A

Prime Source - XS-300FB - Entry Level Power Supply for PC
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Old 18-03-2011, 07:43 PM   #4 (permalink)
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Default Re: System turns off all of a sudden
Before this prob, was ur pc workin fine????
Ur PSU definitely needs a change...
Can u enter the bios?
If yes, enter bios and check the procy temp.....
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Old 18-03-2011, 08:13 PM   #5 (permalink)
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Default Re: System turns off all of a sudden
I have this prob since I bought the PC. As the problem occurred occasionally - once in a week or so i didn't care for it. Now also it occurs like that only. Previously I thought that it was due to power problem at our place.

Process Thermal Margin: 37 C
Motherboard temperature 43 C
MCH temperature 45 C
ICH temperature 82 C
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Old 18-03-2011, 08:22 PM   #6 (permalink)
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Default Re: System turns off all of a sudden
PSU may be the culprit....
now try removing the GPU and connect the monitor to mobo and switch on....
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Old 18-03-2011, 08:54 PM   #7 (permalink)
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Default Re: System turns off all of a sudden
Try to reconnect everything once. Else most probable PSU.
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MSI P45 Platinum(BIOS v1.7B)|Q9550[E0]@3.85Ghz@1.320V[453x8.5]MCH@1.184V|ICH@1.55V|DDR_V_Ref_A_B@1.05V|NH-D14|Corsair TWIN2X4096-8500C5(5-5-5-15)@1089Mhz@2.14V
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Old 19-03-2011, 03:25 PM   #8 (permalink)
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Default Re: System turns off all of a sudden
Hi, I also came to the conclusion that the PSU is the culprit.
I have replaced the 300 W Prime Source SMPS with I-ball Sprinter -500 W. Hope My system will work fine.
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Old 19-03-2011, 11:08 PM   #9 (permalink)
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Default Re: System turns off all of a sudden
whats the cost of the new PSU? theres better option available but maybe you went for shopkeepers words. all the best. just hope this last for a couple of years.
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Old 31-03-2011, 01:50 PM   #10 (permalink)
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Default Re: System turns off all of a sudden
Thanks guys!
The I-Ball sprinter 500 W costs Rs. 2400/-
After the replacement the problem solved.
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Old 31-03-2011, 04:32 PM   #11 (permalink)
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Default Re: System turns off all of a sudden
Quote:
After the replacement the problem solved.
Be sure to use a proper UPS and also dont directly shutdown your PC. Things like that damage PSU.
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