Member Avatar for Metalmancy

Hello people
Yesterday morning i tried to boot up my PC. Everything went Ok but the monitor wont show anything. All the fans work properly(including the graphics card one) and so the leds but the monitor wont show anything. The monitor's power button keeps flashing all the time. I know it's not the monitor's fault since i tried it on another computer and worked fine. Any thoughts much appreciated guys.

-Thanks in advance

  • 2 Contributors
  • 5 Replies
  • 97 Views
  • 2 Days Discussion Span
  • Latest Post Latest Post by Metalmancy

Dani AI

Generated

Brief, practical diagnostics for a machine that powers on but shows no video (as discussed by with 's suggestion to try alternate video). The goal is to isolate whether the fault is the graphics output, power delivery, memory/CPU, or the motherboard itself.

  1. Minimal-boot first: disconnect drives, USB devices and all add‑in cards. Leave only PSU, CPU (+fan), one stick of RAM, and the display (use the motherboard video if available). Listen for POST beeps or watch any motherboard LEDs.
  2. Reset CMOS: power down, remove the CMOS battery for 60 seconds or use the clear-jumper per the manual, then try booting again.
  3. RAM and seating: try a single known-good DIMM in the primary slot and try each slot. Reseat CPU cooler and check the CPU fan runs—poor contact or a failed fan can prevent POST.
  4. Power checks: swap in a known-good PSU or use a proper PSU tester. Do not rely on the paperclip test alone; rail voltages under load matter. Verify all motherboard and GPU power connectors are firmly seated.
  5. Visual inspection and bench test: check the board for bulging or leaking capacitors, burn marks, or bent pins. If possible, bench the motherboard outside the case on non-conductive material to rule out shorts to standoffs.

If there are no POST beeps, no diagnostic LEDs, and the bench test with a different PSU and single RAM stick still fails, the fault is most likely motherboard or CPU. If the board produces beep codes or POST codes, consult the motherboard manual to decode them. If under warranty or uncertain, capture the symptom list and seek an RMA or a local repair shop to avoid causing further damage.

Recommended Answers

All 5 Replies

Member Avatar for jbennet

sounds like a bad graphics card maybe?

if it has onboard video try removing the addin graphics card and using that - if it works then we know you need a new card, if not then we can assumne its a bad motherboard and / or ram/cpu/psu

Member Avatar for Metalmancy

tried that but it wont work again. guess its the second one :(
also i forgot to mention that it did this before but after about 5 hours it worked well, but when i shut down the pc again at night, the next morning it wouldnt start

Member Avatar for jbennet

did it overheat?

Member Avatar for Metalmancy

Hmmm can't real tell. It didn't smell burning. Could it be from overheating when the PC boots or it's just burned?

Member Avatar for Metalmancy

/bump

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.