Question Not booting? PSU Fan and CPU Fan is off but I see the LED light flash

[Alex Sargoso]

Recently built a PC but it doesn't boot up. LED light does flash for a few seconds once I turn on the power supply (RM 650W) but the fans do not work and it doesn't boot up at all. Could this be the fault of the power supply or the mobo?

 

[Alex Sargoso]

Make sure it's connected correctly, because even on a normally working system there should usually be at least one beep when the system is powered on and begins the POST process. Maybe not in all cases though.

I'd definitely bench test it using the guide I posted earlier.

Also, check ALL of these things, first.

"No POST", "system won't boot", and "no video output" troubleshooting checklist

"No POST", "system won't boot", and "no video output" troubleshooting checklist This checklist is a compilation of troubleshooting ideas from many forum members. It's very important to actually perform every step in the checklist if you want to effectively troubleshoot your problem. 1.Did you...

forums.tomshardware.com

I will do, I'll get back to you see if anything changes.

 

[Alex Sargoso]

Make sure it's connected correctly, because even on a normally working system there should usually be at least one beep when the system is powered on and begins the POST process. Maybe not in all cases though.

I'd definitely bench test it using the guide I posted earlier.

Also, check ALL of these things, first.

"No POST", "system won't boot", and "no video output" troubleshooting checklist

"No POST", "system won't boot", and "no video output" troubleshooting checklist This checklist is a compilation of troubleshooting ideas from many forum members. It's very important to actually perform every step in the checklist if you want to effectively troubleshoot your problem. 1.Did you...

forums.tomshardware.com

Just a quick update, I asked a friend to help me with disassembly, he has been building PCs for a while now but he will be busy until Thursday. Will hopefully figure out the problem then.

 

[Alex Sargoso]

UPDATE (SOLVED): The PC is now fixed! Me and my friend disassembled it and then started from scratch. There were no faulty parts at all and it seemed like it was just either loose wires or components not fitted in properly. The three red lights indicated that the power was on previously during testing but no other problems whatsoever. Sorry it took a while to update you guys I was fairly busy. Thank you all for the help!

 

[Darkbreeze]

This is EXACTLY why we say to start over, or bench test, and go back through everything again. I've had at least TEN threads this month where nothing was wrong, and simply doing it all over again cured the problem with no reason as to why. Sometimes it could be a simply as a piece of fluff in a DIMM slot, or a 24 pin ATX cable that is just BARELY, MINUTELY, not fully seated. That is all it takes. So, glad you got it sorted out and this is why we always point to the "please try all these issues for no POST issues thread" and why I recommend a bench test, before doing any prolonged in depth troubleshooting. Even when somebody says, I've done all that, usually, they haven't "done all that".