PC components are starting up, yet the display remains inactive or displays an error message.
PC components are starting up, yet the display remains inactive or displays an error message.
I've owned a laptop for years, but switched to a PC to dive deeper into serious gaming. My friend, who crafted his own setup, gave me some used components and assisted with assembly since I lacked experience. Recently, after much testing, the diagnostic screen appeared on my monitor during preboot (when the motherboard was removed). I powered off the machine and spent hours securing everything inside. After connecting the monitor and power supply, I watched fans spin and RGB lights dim slowly, then checked the screen—still empty. Occasionally I faced "no signal" warnings or blank displays, but mostly just nothing. I also tried pressing keys and connecting the keyboard, yet nothing changed. It's been over two days, and I've tried countless fixes, even following advice from the forum, but nothing resolved it. The worst part? My monitor broke (really sad), yet it still displayed the Koorui logo when plugged in, suggesting the diagnostic screen should still work. EDIT: this happened before I could even boot Windows, so I'm sharing a detailed list below, hoping someone can help or point out mistakes. Details below: CPU: Intel i7 12700k (used), GPU: Gigabyte RTX 3070 (used), RAM: Corsair VENGEANCE RGB DDR5 32G (2x16G) at 6000MHz, motherboard: MSI B760 Gaming Plus WiFi (new), cooling: Arctic Freezer 36, PSU: Be Quiet! Pure Power 12M 750W ATX, monitor: KOORUI Gaming Monitor (24") with 165Hz, SSD: Samsung 990 PRO PCI3 4.0, case: CORSAIR 4000D AIRFLOW ATX Mid-Tower).
Here’s a revised version of your list:
- Attempted using both RAM modules in DIMMA2 and DIMMB2 slots (the ones the motherboard indicates as first choice)
- Tried both RAM modules in the other two slots
- Used just one RAM stick per slot individually and repositioned it
- Replaced the single RAM stick in the DIMMA2 slot
- Replaced the GPU three times due to integrated graphics limitations
- Left the monitor connected while GPU was detached
- Plugged monitor into GPU after removing it
- Kept SSD connected throughout testing phases
- Ran PC with one stick in A2 and B2 slots, GPU and SSD connected for 25 minutes
- Left PC running for about 20 minutes with both RAM sticks in A2 and B2 slots, GPU and SSD connected
- Removed GPU and SSD temporarily to test
- Started PC after disconnecting power from the motherboard
- Connected monitor via DP cable, but it didn’t work
- Used two HDMI to HDMI cables without success
- Tried an HDMI to DP converter with an HDMI cable into the GPU
- Disconnected all power cables and reconnected them
- Powered on PC by pressing the power button on the case instead of the case’s power switch
- Plugged monitor into motherboard when GPU was still attached
- Used multiple outlets just in case the PSU wasn’t supplying enough power
- Tested with a different monitor that was confirmed to work
- Pressed keys repeatedly on the monitor and rapidly pressed power button
- Plugged keyboard into the motherboard and tapped power pins with a screwdriver
- Started PC after turning off the monitor from the wall and only connecting it later
- Plugged laptop into GPU to see if anything appeared
- Used a different monitor that worked
- Kept peripherals off except the monitor during testing