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Pc is constantly switched on & will not boot up

I had a fault & the mains lead shorted out going in to the back of the PC i have replaced the lead & now when you plug it in to the wall socket the pc is not booting up & the boot up light & on of switch are constantly flashing i have replaced the power pack but this has not cured the fault the screen is black can you help pls cheers dave

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Re: pc is constantly switched on & will not boot up

You may also have a fried motherboard unfortunately as the flashing light can refer to a power supply unit problem or motherboard fault

Posted on Sep 04, 2007

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Re: pc is constantly switched on & will not boot up

Most likely your motherboard is the problem about the only option is to replace it

Posted on Sep 04, 2007

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No power and power LED does not light up, this indicates either the mains power is off or you have a faulty power lead. Test the mains socket and the mains power lead.
If these are OK then the fault most likely a faulty switch mode power supply. Remove the switch mode power supply and get it tested at your friendly computer repair shop OR borrow a power supply and insert it into your PC to see if it now boots up.
If it boots up the replace the power supply with a new switch mode power supply with the same total wattage or higher wattage.

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When switching on PC it does not boot up fully

Hi Craig

From what you are descrbing one of the background services is preventing start up from completing

Please try the following

1) Switch on PC
2) Continuoulsy press the F8 key until a start menu is presented, choose safe mode from this menu
3) Once safe mode has loaded up go to Start>Programs>Systems Tools>System Restore
4) From the system restore menu choose 'restore my computer to a earlier time'
5) From the calendar presented choose a date in bold when this fault wasnt happening and then click on next and follow the screen through
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Most likely a hardware problem: either the memory is bad or the hard disk is no longer accessible. 
Go into the BIOS and put the cd first in the boot order. Then download and burn to a disk a Linux Live-CD like PCLinuxOS
Boot from it and in the boot options select Memtest - let it run for a while, it will tell you if it's good or not. If it is then let it boot fully and open My Computer - if it's there  and you can open it then it's either just a localized hardware fault (you will still have to replace it tho) or Windows was corrupted.
Use PCLinuxOS to recover all your files and reinstall Windows (this time use a much better antivirus like Avast). If after a short time you have the same problem then the hard disk is dying, replace it.

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Boots up but only runs for about a minute. Then fan runs at full speed constantly with no video. Also front panel popwer switch appears shorted. i.e as soon as you plug in the PC starts

Very well could be overheating or powersupply problem. Most Definately Hardware related. You can try opening up the case and blowing air into it from compressor. (Make sure to do this outside away from clean items). Also, check CPU fan and heatsink to make sure fairly clean. CPU fan may also be old and need to be replaced. Don't put case back on and try again. Look at CPU fan to see if moving (or struggling). If computer stays on longer then CPU fan most likely the problem. If off in same time as before then most likely the main power supply problem, in which case the only way to check this is to replace the power supply. Hope this helps, Best Regards,

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My Dell Dimension desktop 9150 was running very slow so I shut down the computer. When I pressed the power on button I notice that it was flashing. I pressed the button even holding the power button in...

the constant Green, states that the motherboard is getting Power.
The red/yellow would possibly suggest, that the ethernet port has a fault or possible corruption.
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Remove side panel. take out any ethernet-Cable from the rear.
Locate the CMOS battery, round silver Battery on The motherboard.
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You could also try This. Boot with Hard-drive power Cable Disconnected ( this will Eliminate HD Fault ) same for CD/DVD drive et,c.

Mike @ Compurepair.

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Help troubleshooting

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