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From: Ray on 1 Nov 2009 08:18 When i start my computer up, the fan starts to whirl very loud and after 20 secs the computer shuts down, any ideas ?
From: John McFerren on 1 Nov 2009 08:42 On Sun, 1 Nov 2009 13:18:35 -0000, Ray wrote: > When i start my computer up, the fan starts to whirl very loud and after 20 > secs the computer shuts down, any ideas ? I'm going to need more information to tell for sure, but I do have a few possibilities. First, you have a faulty power supply. Personally I think that the power supply is the most overlooked component in the computer system. Second you could have a fault with your mainboard. Third is a possible virus on your system. Since you are saying that it shuts off after 20 seconds I am thinking that the system may be trying to boot off the hard drive. A boot sector virus could in theory at least give the ACPI command to shut down the system. There are a few others. Okay, the questions to help you further, additional info is in parenthesis and brackets when needed: -Is there any display on the monitor? (To see how far POST makes it and to see if video chipset is operational. -Is there anything odd being displayed on the monitor when your system starts booting from the hard disk (if it reaches that far)? -Did you add any new hardware or software lately? (Standard Computer troubleshooting Question) -Is there a floppy in the floppy drive? (If present) -Are there any USB storage devices connected? (floppies, flash drives, card readers with cards inserted [including internal units], hard drives, etc) -Was their any other unusual happenings? (Standard Electronics Troubleshooting question, helps with computers as well) -- John McFerren AST Computer Servicing Technology Amateur Radio Operator General Class: KB3PXR
From: Jeff Strickland on 1 Nov 2009 10:45 "Ray" <ray285(a)btinternet.com> wrote in message news:0r-dneGf-6ExF3DXnZ2dnUVZ7s6dnZ2d(a)bt.com... > When i start my computer up, the fan starts to whirl very loud and after > 20 secs the computer shuts down, any ideas ? > Bad power supply?
From: Ray on 1 Nov 2009 11:11 Hi John, Hopefully the answers below: Definately no virus, hard drive has been reformatted. >> When i start my computer up, the fan starts to whirl very loud and after >> 20 >> secs the computer shuts down, any ideas ? > > I'm going to need more information to tell for sure, but I do have a few > possibilities. First, you have a faulty power supply. Personally I think > that the power supply is the most overlooked component in the computer > system. Second you could have a fault with your mainboard. Third is a > possible virus on your system. Since you are saying that it shuts off > after > 20 seconds I am thinking that the system may be trying to boot off the > hard > drive. A boot sector virus could in theory at least give the ACPI command > to shut down the system. There are a few others. > > Okay, the questions to help you further, additional info is in parenthesis > and brackets when needed: > -Is there any display on the monitor? Yes it shows Windows XP booting > up. then windows set up. > -Is there anything odd being displayed on the monitor when your system > starts booting from the hard disk (if it reaches that far)? Nothing > unusual. > -Did you add any new hardware or software lately? Reformatted the hard > drive from Windows Vista back to Windows XP > -Is there a floppy in the floppy drive? (If present) No > -Are there any USB storage devices connected? None only the printer > -Was their any other unusual happenings? None > -- > John McFerren > AST Computer Servicing Technology > Amateur Radio Operator General Class: KB3PXR
From: Paul on 1 Nov 2009 12:08
Ray wrote: > When i start my computer up, the fan starts to whirl very loud and after 20 > secs the computer shuts down, any ideas ? > > Check to see if the clip that holds the CPU heatsink/fan to the CPU socket is broken. It could be, that the CPU is not being cooled, because the heatsink is no longer in contact with the top of the CPU. Modern processors have "THERMTRIP", which is overheat protection, and that signal is tied into the PS_ON# signal on the power supply. If the CPU thinks it is getting too hot, that hardware signal shuts off the power, without needing any software to do it. It is effectively just a thermal diode and hard wired logic. If you take it apart, you can put some fresh thermal paste on top of the processor. The thermal paste enhances heat transfer. A thin layer of paste, displaces air in the gap between the two surfaces. http://www.arcticsilver.com/pdf/appinstruct/cmq/ins_cmq_singlecore_wcap.pdf Paul |