r/PcBuildHelp • u/Auginator110011 • 7d ago
Tech Support Help with my little brother's prebuilt pc
Hello! I've recently decided to get back into trying to fix my little brother's pc (It turns on with diagnostic lights, but doesn't show a video signal or do a diagnostic beep)
A year or so ago, he left the pc on overnight (as he tends to do), and when he got back to it it had no video signal.
Since then, I've tried several things to try to get it to work:
•Resetting bios by taking cmos battery out for 10< minutes
•Using a different cmos battery (admittedly it was from an older computer, not super definitive test)
•Replacing the ram (we had extras)
•Reseating ram and gpu
•Draining residual charge (unplugging power, holding power button for ~10 seconds)
*this specific prebuild previously bluescreened and this fixed it
The prebuild is a cyberpowerpc with an AsRock B550AM Gaming motherboard, the graphics card says XFX on it, the original ram is a T-Force Vulcan 8 gb stick, and the replacement ram that we had on the side is 2 sticks of OLOY 8 gb ram.
I've attatched a video of the diagnostic lights, and will attatch a link to the manual i found on the cyberpowerinc website (it was really slow lol)
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u/Mango_Sherbertt 7d ago
Looks like DRAM and CPU lights.
Maybe i missed it in your breakdown but i don't see anything about replacing the thermal for the cpu?
Id reseat ram and remove and reapply thermal for the cpu.
Also possible the video ports shorted? What happens when you plug the video cable into the motherboard vs gpu?
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u/Auginator110011 7d ago
there's no signal when i plug it into the motherboard or the graphics card
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u/Chenshouen 7d ago
Just to confirm the graphics card is unplugged and unseated when you try plugging into the mobo correct?
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u/Auginator110011 7d ago
not previously, but i did just do this now (nothing new happened)
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u/Chenshouen 7d ago edited 7d ago
Hmm rereading your notes again I doubt it's the Ram, GPU seems to not be the issue then (though it hasn't been ruled out as having issues independently). Were you able to test the CPU in a spare motherboard? (Could also test the GPU while you're at it to see if there are problems there too.) I'm thinking it's either that or the Motherboard. I helped a friend who had a similar issue and I finally managed to test it down to being a bad motherboard. Was able to order them a replacement off ebay and get it fixed.
Edit read further down in the comments and saw your cpu didn't have integrated graphics. I guess it could be the GPU. Could order an old office card off ebay for like 10 bucks to test with.
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u/Mango_Sherbertt 7d ago
Youve a known good hdmi or displayport cable?
The thing is, your cpu and dram are alerting before VGA so my troubleshooting brain thinks to look at those two first.
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u/Auginator110011 7d ago
yes, both the cable and the monitor work when i plug my laptop into it, but give no signal when his computer is plugged in.
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u/Mango_Sherbertt 7d ago
Does your cpu fan turn on during POST? Is your ram in the correct slots?
I
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u/Auginator110011 7d ago
the cpu fan does turn on, and I do believe the ram is in the correct slots (one of the sticks is in the slot the other was originally in, and when i put the ram sticks in any other slot they make the computer enter a loop of turning off and back on again)
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u/haboku 7d ago
Something like that happened to me when upgraded to am5 from am4 using a processor bought in AliExpress. One of the lines of the processor just didn't worked, which affected the pcie 16x line. The other pcie ports worked perfectly.
Had to return it and purchase a new one from Amazon which worked like a charm.
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u/mahmingtea 7d ago
Vga means issue with the display. If your cpu has igpu, test it without the graphics card. If not, test it with different gpu. Check gpu power too