york98
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System cannot start, no beep, no screen
Recently, I just changed the case for my system, however, after i changed the case, my system cannot startup.
Here is my problem.
When I turn on the power, the CPU fan starts up, the vga fan also starts, but there is no screen, no beep, after few seconds, the vga fan shuts down.
I tried to unplug all cards and re-install to it, no use; and I use another display card, no use.
I tried to re-install the ram, no use.
I tried to re-seat the cpu, no use.
I tried to change the power supply, no use.
I also tried to remove the batteries on the MB for an hour, no use.
The only thing I haven't tried is to switch the CPU and motherboard. Isn't that the problem of the CPU or motherboard?
Here is my problem.
When I turn on the power, the CPU fan starts up, the vga fan also starts, but there is no screen, no beep, after few seconds, the vga fan shuts down.
I tried to unplug all cards and re-install to it, no use; and I use another display card, no use.
I tried to re-install the ram, no use.
I tried to re-seat the cpu, no use.
I tried to change the power supply, no use.
I also tried to remove the batteries on the MB for an hour, no use.
The only thing I haven't tried is to switch the CPU and motherboard. Isn't that the problem of the CPU or motherboard?
It sounds like you are missing the 12 volts for cpu - normally a 4 pin plug
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But since you changed the case, i suggest to take out the motherboard, put it on a piece of plastic, or hardboard, and start it out of the case, as you may have grounded something; look for the screw positions and such
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Lets hope you were wearing a ESD wriststrap when putting your PC together. Not wearing one can cause a static discharge and ruin important hardware. Also make sure you put in all of the motherboard screws in so the mobo will be grounded to the case like nobus said.
ASKER
My system is AMD Socket A, it only has one power supply plug.
Since there is no screen, the harddisk light didn't flash, I don't know whether the system is running or not, but the CPU fan do still running, and I can see from the Thermal Panel that the CPU temperature is switching between 29-30 degree.
Yes, when I hold the pwr switch for few secs, it do turned off.
Since there is no screen, the harddisk light didn't flash, I don't know whether the system is running or not, but the CPU fan do still running, and I can see from the Thermal Panel that the CPU temperature is switching between 29-30 degree.
Yes, when I hold the pwr switch for few secs, it do turned off.
Dose your keyboard power on?
then you cpu shows some activity. i suspect the motherboard. did you try my suggestion to test it out of the case?
<<AMD Socket A, it only has one power supply plug>> Yes, but is it a 24 pin or 20. If it is a 20, there is a square 4 pin socket on the board which must have power plugged in. If there is no plug, you have the wrong power supply.
Chris B
Chris B
If the only thing you have done is change the case, then its a grounding issue.
ASKER
I finally change the MB, but it's not working again, then I changed the CPU, then it works this time.