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I have a computer that won't start. No power at all. I tried a different power supply and still the same thing.
Could it beThe front case switch?
The motherboard?
The CPU fan?
I am not an electrician so I really have no clue other than to know it's not the power supply.
Any suggestions?
Thanx in advance.
Cheers
OVV
Have you confirmed that the electrical outlet you're using has power? Did this just start happening?
Life is more painless for those who are brainless.
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Is this a PC you just acquired and are trying to fix?
If you changed the PSU are you sure it was all plugged in properly and that it was another working one you tried?
Some HELP in posting on Cnet plus free progs and instructions
Hopefully my advice will help you...Please post back your result
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It is a friends computer. The outlet that I used is the one that my computer is currently plugged into as I am typing. The power supply that I tried in it is tried and true and I verified that all cables were plugged in properly. I recently installed ADSL for him and it did not start right away the first time I turned it on at his place. I eventually got it going there after turning his power bar on and off and he has had no problems for 2 months. He told me that 2 days ago he went to start it and....... nothing.
I build and fix computers regularly but like I said, I am not an electrician. I figure if it's not the power supply, it might be the actual switch on the front of the case or even the motherboard. I have also heard that a dead processor fan might stop a computer from booting but I would figure that it would at least start to post before shutting down.
Should I send him to an electrician?
I am trying to avoid sending him to a computer store because I am in France and most of their technicians are kids who seem to know even less than yours truly.Thanx for the quick replies.
OVV
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If you're certain that the switch on the front of the case is defective, try taking out the mobo and benchtest it just to verify, also make sure the CMOS jumper on the mobo is correcty positioned on the 'default' side(1-2) not on the 'clear' side(2-3).
gf
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Power supplies have two modes.
1. They supply just a minimum of voltages to the motherboard all the time.
2. When the power on switch is closed the power supply brings up all voltages to the motherboard. The motherboard checks the voltages to make sure that they are within tolerances. If they are, the motherboard sends a 'power good' signal back to the power supply. If the power supply does not get that signal it goes back to minimum mode.
So a motherboard problem can cause your symptoms.
Also
If one of the devices connected to the power supply has a short, the supply will not come up.
Do yourself a favor BACKUP!
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Something that could be overlooked is the Power switch on the PSU at the back of the case. Also verify the voltage is set to 115AC assumming that is local power requirements.
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Try a jumper in place of the Front Power Switch to determine if the switch is faulty. Use the jumper inlieu of the switch. If this works, replace the switch.
Next, at the Power Supply plug on the Motherboard, jumper the power switch wires by backprobing the Power Supply Plug.
You'll want to find a PinOut Diagram of the Motherboard PS plug to determine which wires to bridge. (Do this only if there is access for Back Probing. Careful not to damage wires or Plug.Do not pierce wire insulation Jacket).
PinOut Diagram should be available on Mobo Website.
This bypasses the front switch circuit. Unfortunately if this works the problem is, most likely, on the Motherboard. Repair? Unknown to me.
There is nothing to learn from someone who already agrees with you.
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