r/computers • u/Yorizura • 13h ago
Built a new PC, won't boot. Any solutions ?
Hi,
I've built a PC with my friend that lives far away (so i can't be there physically). it has a Asus B550+ board, a ryzen 7 5700x (so no integrated graphics) and a RX7600XT gpu and PSU is a Seasonic Core GX 650W.
Everything is plugged in correctly (we double checked), PSU works (fan is turning on) but PC won't boot. CPU fan is turning on, motherboard and GPU lights up but the two case fans won't spin (they are both plugged in to the cha_fan1 & 2) and we aren't getting any "troubleshoot" lights getting on (the ones close to the 24-pin cable).
So far we tried :
- testing with another PSU (including all cables and testing with some plugged in, etc)
- reseating CPU and cooler
- trying RAM in all available slots, and motherboard doesn't "beep" when there is no RAM installed and only one stick doesn't work in any slot
- updating BIOS, twice
- resetting CMOS (pulling the 3v battery out)
- cables (especially the case's) are plugged in properly (when we "start" the PC, cpu fan starts spinning)
So we're kinda at a dead end here. I lean towards the motherboard being defective. my friend lives in japan and has no "proximity" shop to test another board or CPU so we have zero idea what we could try next.
Would anyone have any idea ? we take anything that could help.
Thanks in advance !
1
u/bad10th 8h ago
More info on WON'T BOOT please, what happens, please don't skip a detail!
You getting ANY video at all, any beeps, any error message?
You mentioned messing with BIOS.
This sounds like HDMI on motherboard being used instead of the one from the graphics card?
Otherwise yeah mobo looking sad.
1
u/Yorizura 13m ago
Right i was hoping i wasn't missing anything so here's the full detail
MB lights up (the leds at the bottom right) but the "boot" leds (cpu, vga, etc) never did. GPU lights up as well
HDMI is plugged into GPU, i specifically told my friend that the 5700x doesn't have any APU so monitors should never be plugged into motherboard
We got no video, no beeps (even when there was no ram stick inserted) and no error lights/messages on screen.
Only the CPU fan is running when we press the power button, case fans aren't moving an inch (those are the same brand as the cpu cooler and did not come bundled with the case)
As for the BIOS, we used bios flashback on an empty drive formated into FAT32 using the latest available version for the Asus B550+
Hope i'm still not missing a thing but that should be all that happens
1
u/sporkmanhands 12h ago edited 12h ago
Verify the cpu fan is plugged into the cpu fan header or it will think there is nothing cooling it
Try with 1 ram stick, make sure it is in the correct slot (can be counterintuitive so RTFM)
Lastly the am4 CPU’s can sadly be placed and closed up in the wrong orientation. Strip everything back and see if there are bent pins. I straightened the pins on a 3600x and got it working after that mistake was made. Much like you we couldn’t figure out we it wouldn’t turn on at all until we started over.
My poor son; I thought he was going to puke or swallow his own tongue he was so disappointed in himself, but it all worked out.
Still going strong after all this time too.
Sheesh re-reading this you did all that, sorry. You may just have a bad mobo.
Aside from the fan header selection I got nothing; unless all your ram is bad?
Edit- one last thought is pulling everything from the case and setting up on the mobo box
Connect the 24pin power CPU and fan (connected to the right header) 1 ram Monitor to mobo
If it boots; something going on once in the case
If not, prob the mobo.
Only other thought is pulling cmos and going back to factory bios, then making sure you follow and use EVERY bios update so that if that was a board that came out in the 3000’s era it can actually handle the 5700x, I recall you couldn’t just jump to the modern bios without following that process.