Sometimes 'DP No Signal' appears, but everything functions properly—time for some analysis!
Sometimes 'DP No Signal' appears, but everything functions properly—time for some analysis!
Issue Summary: Occasionally, both monitors show "DP no signal" after powering on, waking up, or restarting my PC. I can connect once but need to press the power button long, wait, then turn it on again, or perform a full power cycle. Once I manage to connect, it demands a prolonged press or a reboot to function properly.
PC Details: Processor – AMD Ryzen 3600; Motherboard – AsRock B550M Pro4; GPU – XFX Radeon RX 7700-XT (upgraded from GTX 1660); Power Supply – Enermax Revolution D.F.12 850W (upgraded from Corsair CV650 650W); RAM – Klevv 16GB, dual channel, 3600MHz
Actions Taken:
- Reconnected all cables and GPU after disassembly; resolved at first boot but still faced issues post-restart.
- Booted PC with only CPU, GPU, RAM, monitor, keyboard, and mouse connected; issue persisted after multiple restarts.
- Reset CMOS using battery; required re-setting all connections to fix the problem.
- Reinstalled Windows and updated drivers/updates; issue recurred intermittently.
- Tested stability with OCCT; observed high CPU temps (near 90°C) during testing, but no lasting damage.
- After GPU and PSU upgrade, PC remained stable for several days before the problem reappeared.
- BIOS was up to date prior to upgrades; no changes made afterward.
- Motherboard logo display duration increased from under 5 seconds to nearly 10 seconds post-upgrade.
- Previously used Windows 11; switched to Windows 10 (x64) after reset, but issue returned after CMOS reset.
- Experienced intermittent "DP no signal" during gaming sessions, especially with demanding tasks like Monster Hunter Wilds.
Notes: The problem seems linked to performance bottlenecks and thermal management. While gaming runs smoothly once set up, frequent restarts and high temperatures raise concerns about long-term reliability.
I've observed that the LED signals on the motherboard signal whether the system will start up properly. When the most recent LED turns on first and then the VGA LED, the PC should boot normally. But if the VGA LED activates before the BOOT LED, I won't connect to my monitor.
Through multiple attempts and adjustments, I've managed to minimize the frequency of this issue. As discussed earlier, I've faced this challenge with both current and older BIOS releases. It appears that the most recent BIOS for ASROCK B550M Pro4 (version 3.61) isn't fully stable with my setup, so I reverted it to version 3.40. After updating to this older version, out of ten restarts and shutdowns, the problem occurred only once. I'm still working to eliminate it completely, but with limited understanding, I'm unsure about the best solution. I hope this helps someone experiencing the same situation.