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PC wont start up at all. When the button is pressed, the CPU fan twitches and an LED on the motherboard lights up, below the words 'RAM LED':
I have tried unplugging everything from the motherboard (except power obviously) and removing the RAM but the same happens.
The motherboard is a Gigabyte GA-7VA.
Any help much appreciated!
The fan starts to spin but then immediately stops - more of a twitch than a spin since it picks up no speed and rotates only a tiny amount.
The CPU should be working fine - it has not just been installed, and has not been fiddled with.
The PC has been up and running; I have been using it before but no longer need it and am giving it to a friend. He had it running at his house, went out, and when he returned the PC was off and had the problem, so the cause is not known.
It sounds as if the CPU fan has failed/needs cleaning
Remove it and clean it with a paintbrush/softbrush and then reseat it.
When I received a brand new pc the same thing ocurred. (I thought that the bios would still run then report fan or temperature fault on most mobos?) Anyway, turned out the connection from power supply to mobo wasn't fully home, removed and re-inserted and this seemed to do the trick - touch wood no problems for a year now.....shouldn't have said that!!!
Still no luck - have cleaned the fan, even tried a different one, both times with same result. Also, the motherboard power supply is correctly seated.
Is it likely to be a problem with the motherboard or CPU?
Most likely PSU failed.
If renewing a PSU check:
1. The physical size of your PSU, some are hard to replace due to being a non standard size.
2. The amount of power need from the PSU don't skimp
1. Physical Dimensions
Besides the specs and form factors, the physical dimensions are also important factors in selecting a compatible power supply. Here is an outline of the physical dimensions of most standard power supplies:
# ATX: 6x3.5x5.5", HxWxD. Most common. Uses 4 mounting screws.
# Mini-ATX: 5x3.5x5", HxWxD. Rare size. Uses 4 mounting screws. Can be used in a regular ATX case, but often not the other way around.
# MicroATX: 5x3x4", HxWxD. Use 3 mounting screws. Not interchangeable with ATX or miniATX.
# Flex ATX: Even smaller than Micro ATX. Various sizes according to case specs; often not interchangeable.
Use the data above to determine if a particular power supply would fit your case.
The quality of a power supply can be estimated by its weight. While this is not a true scientific or thorough measurement of the power supply reliability, it is nevertheless a very simple and easy way for ordinary PC users to estimate and compare the quality of a power supply.
2. Power supply calculator click here
Guide to changing PSU
PSU could be buggered even though the motherboard LED lights up, indicating that (at least some) power is reaching the motherboard?
It was the PSU, thanks all for your help. Alas onto the next problem...
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