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Computer Starts but not signal to monitor

Tags
black screen signal monitor turns on problem

Fixed Computer Starts but not signal to monitor

Starting stats
Gigabyte motherboard(sorry dont know what it was exsactly built another computer with it and gave it away)
i5-3570 LGA1155 cpu
8GB RAM
1TB HD - Running windows xp
Gigabyte GT 630 2GB Graphics card
600 PSU

So my computer keeped slowing down and I knew something was wrong with the hardware but did not have the money so I just keep
using it after a while it becasue so slow I start fiddling with it. Thats when the computer would start but I would get no signal to the monitor. So I went to the computer store to see if they had an idea, after getting blank looks from the guys behind the counter a customer sugested it might be the PSU.

I brought a PSU and tried to use it but got the same effect. I have enough part lying around that I was able to check all the other components in the computer and worked it down to the CPU or motherboard. I sent the computer to a computer store to see if they could come up with a different conclusion, 6 days later they told me what I already knew the good news was they didnt change me anything.

I replaced the gigabyte with a asus Motherboard, still nothing changed. I replaced the i5 with an i3 and the computer started up but was still running bad. So I back up my files and wiped the hard drive completely than reinstalled xp. It is running faster now than I ever remember it running. (How ever it can not run to its full potential as it is running xp and the soft ward can not see all the hardware)

I use the left over parts to build this
Gigabyte motherboard
i3 -3240
2GB RAM
250GB HD - Running ubuntu 64 bit
600PSU

Ending stats
Asus motherboard B75M-PLUS
i3-3240
8GB RAM
1TB HD - Running windows xp
Gigabyte GT 630 2GB Graphics card
650 PSU

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  • Latest Post Latest Post by faroukmuhammad

Dani AI

Generated

A short, practical checklist for the “powers on but monitor shows no signal” symptom that complements the troubleshooting already described by and ’s suggestion to check the monitor and boot media. Steps are ordered from easiest to more invasive; stop when the problem changes or is resolved and report the exact symptom (POST beeps, motherboard LEDs, monitor input detection).

  • Quick display checks
    Test the monitor and cable on a known-good PC or laptop; try a second cable and a different input (HDMI/DVI/VGA). Confirm the monitor’s power LED and that its input selector matches the connected cable.

  • Look for POST signs
    Note fans, HDD activity, keyboard caps-lock response, motherboard POST LEDs or beep codes. No POST activity usually points to motherboard/CPU/RAM power or shorts.

  • Minimal bench boot
    Outside the case, power the board with only CPU, one RAM stick, and video (or try without the discrete card to force onboard video). Remove all drives and USB devices. Swap the RAM stick between slots and try different sticks.

  • Reseat and inspect connectors
    Reseat GPU, RAM, and power connectors. Verify any PCIe GPU power leads are fully seated. Clear the CMOS (jumper or remove battery for a minute) and try again.

  • PSU validation
    A PSU can spin fans but fail to provide stable rails. Swap in a known-good PSU or use a PSU tester/multimeter to check 12V/5V rails.

  • Firmware and software checks
    If BIOS is reachable, a firmware mismatch can prevent video. If BIOS posts but OS doesn’t show video, boot a live USB and check kernel logs (dmesg) or X logs; run Memtest86 to rule out RAM.

Cautions: ground yourself for ESD, avoid shorting the board on metal, and inspect the CPU socket and case standoffs for damage. If the GPU’s fans spin but there’s never any output, the card is often the culprit. Post specific observations (beep codes, LED codes, whether onboard video works, monitor behavior) for a targeted next step.

Member Avatar for faroukmuhammad

DO the lights on the screen come on. Does it make any sound? Did you try booting from a CD?

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