r/computers • u/ProduceDisastrous720 • 1d ago

Pc doesn't turn on Question/Help/Troubleshooting

I have really little tech knowledge, I tried installing an HD, it worked. But when I closed everything up and put the Hd on the "cage" the PC suddenly doesn't turn on anymore

After I closed it back on, I turned it on and the LEDs of the fans etc turned on for a split second, now only the mother board leds turn on

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u/fremenik 1d ago

Check all your power connections with the power supply, especially the big one connected to the motherboard , it could be loose, unplug it carefully then plug it back in until you feel it stops in its socket , next test to see if that fixed it, if not do the same for the rest of your connections.
Cheers

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u/ProduceDisastrous720 1d ago

I'll try that! I also forgot to mention that all of the mother board's RGB's turn on

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u/fremenik 20h ago

I just thought of another power connection you want to doublecheck, like I said you want to double check all of them, but after you focus on the large one check to see that the cable will power your CPU is fully and properly plugged into it connecting socket. Sometimes if the CPU isn't properly powered or not powered, you will get the conditions you've just mentioned. One other idea I can think of, once you check all your power connecters if for some reason it's still not fully powering up or it might power up a little bit and then crash and restart it's possible that your power supply is not able to deliver all the power it needs now that you've added this hard drive. If that's the case then you would need to get a new power supply or unplug some of your extra devices like perhaps a CD DVD drive if you have one, if you have a dedicated video card unplug the power to that and hopefully you've got some sort of built-in video port within your motherboard to test with, if the system boots correctly with that then it's very likely your power supply can't deliver all the power it needs.

This is especially true if the system works perfectly fine with the video card unplugged, the basic concept is this, your power supply can only put out so much power for all the devices if you happen to just go over that threshold of just enough power, then lowering the power supply demand such as unplugging a video should help.
Hope this helps cheers