Discussion PC turns on, but there's no display.

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Unselles

Commendable
Feb 17, 2019
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My PC turns on, lights and fans are working (motherboard, GPU, cooler and all other fans), but there's no display plus mouse and keyboard lights aren't working. Everything seems to be on place and correctly plugged.
I have no idea where the problem could be.
I forgot to mention that this problem occurred because I've changed my power supply.
 
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Page 1-7 of the manual here section 1.1.6 Headers; then 1. Clear RTC RAM (2-pin CLRTC).

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You didn't provide full system specs. I don't know what parts you have including what graphics card if any and what CPU etc.

If you have a discrete graphics card, I'd suggest reseating the PCIE aux power connectors to graphics card and check again.

If no success, I'd say take out the graphic card and connect the display to the motherboard graphic output if you have a CPU with iGPU.
 
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Sorry about that, my GPU is GTX 1070 Ti and CPU i7-7700. Also, I've been using PCE-I cables until now, but the cables that came with this PSU are VGA, so I used these.
 
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It is modular, but it came with VGA cables, not PCE-I. I tried both of them, PCE-I and VGA, both with the same result. The GPU seems to be working fine, there's just no display, plus keyboard and mouse isn't working.
 
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Unselles said:
Well, I've just unplugged and plugged everything back in. The problem is still there, I have no idea why is this happening.
Click to expand...
Unselles said:
It is modular, but it came with VGA cables, not PCE-I. I tried both of them, PCE-I and VGA, both with the same result. The GPU seems to be working fine, there's just no display, plus keyboard and mouse isn't working.
Click to expand...
PSU don't have VGA cables. It only have 1 for monitor power cord (none for new ones) and 1 for PSU power cord. Do you mean the GPU? I assume it is.

Please go back to the basic step by step troubleshooting protocol before posting and come back and tell us what is the result.

  1. Check all cable connections if loose or faulty - power cables, signal cables, sata cable, 4 pin/24 pin.. and include the outlet also if it's working properly. Plug it directly on the wall.
  2. Remove all external drives like flash drives, external hard drives, USB hub, keyboard, mouse, speakers, etc.
  3. Reset the bios, replace the battery if possible.
  4. Clean your CPU. (not the processor, im talking in whole)
  5. check if all fans are working properly (overheating problems)
  6. clean the RAM (gold part) with eraser, reseat it properly and boot, if no boot, put it on the other socket and boot, if no boot, put it back on the original slot and boot again.
  7. clean your processor and heatsink (thermal paste) with rubbing alcohol carefully and add a new thermal paste. Do the same with your GPU if it's already dried up.
  8. replace your graphics card or use built in graphics
  9. remove your HDD if it will boot (or replace it with a working one)
  10. and any other possible parts you might want to check.
if nothing happened, check your PSU if it's faulty by paperclip testing it. If the fan do not spin, it's dead. If it spins wait for a minute if it will blow up. If it do not blew, it's working. Now use a PSU tester to check if it's providing a stable power or not.

If everything did not solve your problem, proceed with your motherboard and processor. The worst case scenario.
 
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Unselles said:
It is modular, but it came with VGA cables, not PCE-I. I tried both of them, PCE-I and VGA, both with the same result. The GPU seems to be working fine, there's just no display, plus keyboard and mouse isn't working.
Click to expand...


Well... you probably just fried your PC.

NEVER EVER used cables from one PSU to another unless you KNOW they're compatible.

PCIe and VGA cables are the same thing. They're just labeled different.

The pinout of your old Seasonic PSU and the new EVGA are not the same. If you use the Seasonic cables on the EVGA power supply, you probably just shorted out your PC.

EVGA/Superflower pinout (clip on top):

GND GND GND GND
GND +12V +12V +12V

Seasonic M12II pinout (clip on top):

+12V +12V +12V +12V
N/A GND GND GND

You literally reverse the polarity going to the graphics card by using the wrong cables.

HOPEFULLY short circuit protection kicked in and you're ok. But since you said that you put the old PSU in and it still doesn't work, my guess is that you fried your card.

Pull the graphics card out of your build and plug your monitor into your motherboard's VGA out. Let's see if the PC still works and maybe you only fried your graphics card by using the CPU's integrated graphics.
 
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jonnyguru said:
Well... you probably just fried your PC.

NEVER EVER used cables from one PSU to another unless you KNOW they're compatible.

PCIe and VGA cables are the same thing. They're just labeled different.

The pinout of your old Seasonic PSU and the new EVGA are not the same. If you use the Seasonic cables on the EVGA power supply, you probably just shorted out your PC.

EVGA/Superflower pinout (clip on top):

GND GND GND GND
GND +12V +12V +12V

Seasonic M12II pinout (clip on top):

+12V +12V +12V +12V
N/A GND GND GND

You literally reverse the polarity going to the graphics card by using the wrong cables.

HOPEFULLY short circuit protection kicked in and you're ok. But since you said that you put the old PSU in and it still doesn't work, my guess is that you fried your card.

Pull the graphics card out of your build and plug your monitor into your motherboard's VGA out. Let's see if the PC still works and maybe you only fried your graphics card by using the CPU's integrated graphics.
Click to expand...

That might be the case. But if he got a bad PSU leaking power everywhere, same worst case scenario if surge protector don't kick in. Happened to me few days ago, replaced a bad PSU with another worst one. Surge protector (mobo) kicked in, turns out power supply is about to fry my machine. Same symptoms: computer runs pretty normal after switch on but no signal. Sometimes it boots, most of the time not booting at all while every fan seems normal.
 
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