I have my friends PC at my house to change a few components but apparently the PC doesn't work properly. I insert the power connectors ( 20 and 4 pin connectors ) into the motherboard, plug the power cable into the PSU and when i turn the power button on the PSU the computer will start but do nothing. It never worked like that before, i always used the power button from the computer to turn it off and on. And this happened just after i changed a PSU. Now the old Power Supply doesn't work either. Is there any way to stop the computer from turning itself on ?
Besides those broken options mentioned already, many BIOS have settings to start on on power restore. This is use a lot in home servers, where if you have a power failure, you want the machine to re-boot when power comes back on. I have that set on my web server, and my Linux router box. These settings can be found in most BIOS under power, or power management. Look for some setting that asks what to do on power restore.
There are two possible problems 1. there is a short on the motherboard, specifically, the power on circuit. It is acting like the power button is held in. May have a faulty board. 2. The cmos has reset, and the default setting for activity on power failure is full on. Meaning, if power is lost to the computer (even if it is off), it will power on. A simple change in the bios would fix this In all likely hood, #2 is your problem
Something is broken. Likely the motherboard, but could be the PSU.
On the motherboard, you will find a small battery. If you take it out, it resets the BIOS. Make sure the power cable is unplugged as well. Other wise a new mother board is required.
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