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Posted 09 May 2011 - 12:12 PM
Posted 09 May 2011 - 03:55 PM
Posted 10 May 2011 - 07:57 PM
Hello and welcome to Bleepingcomputer.
First things first, can you please post the full model number of your computer, it should be listed somewhere on the tower on a label.
Reading your description above sounds at first like a possible faulty switch.
By faulty I mean it is getting stuck in the "ON" position, these switches are designed to create a momentary connection, like that of a common doorbell switch.
You press the switch it sends a signal to the controller chip, which in turn triggers the PSU to activate the rest of the system, power it up.
Motherboards have an array of pins which are labeled as the front panel connector, these pins are for the HDD LED, POWER LED, RESET and the ATX POWER/SOFT OFF SWITCH.
Pressing the ATX POWER SWITCH once activates the system, pressing and holding it in once system is up and powered up, allows the system to safely power down the operating system and turn the system off.
If the switch is stuck in the on position for any reason this can cause the system to power up then off again, if the reset switch becomes stuck you can experience system problems as well.
Those switches can sometimes become stuck for various reasons.
There are two pins on the motherboard which are labeled ATX POWER, jumping these two pins together without the switch attached can power up the system manually, I want to caution you, the contact of those two pins should only be momentary, like a few seconds at the most, that is MORE than enough to get the system to react and power up the system.
Shorting those two pins out longer than that will cause system to power back down again, because you have activated the soft power off option.
Since I do not know what motherboard you have, I can not offer the pin locations to you in this post, perhaps once I know what system you have I can look at a motherboard map and tell you what to look for.
As for your PSU being a possible issue here, that is possible that there is something faulty with your PSU, but before I conclude with that assumption, I want to first make sure it is not something as simple and cheap as a power switch on your computer case.
Posted 10 May 2011 - 08:09 PM
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