Start with Asus Rampage IV's troubleshooting guide.
Start with Asus Rampage IV's troubleshooting guide.
He has been using his old PC for nearly three years and recently it stopped turning on properly. Initially, resetting the CMOS helped, but now the system boots with the ASUS logo, then displays a black screen regardless of whether he presses DEL/F2 or attempts to power it up. Only restarting resolves the issue. He has tried flashing the BIOS and replacing one of the BIOS chips, but the problem persists. The CMOS battery seems intact, the GPU and RAM are functioning correctly, and memory tests passed. He hasn't changed the CPU yet, though it's an E5-2680 atm, which is a solid chip for its cost. The system has 4x8GB RAM at 1600MHz, paired with an EVGA GTX 1070, an Akasa Voodoo Venom cooler, and a mix of HDDs and SSDs. He's also experimented with different RAM modules and a new GPU without success. The only times it works are after a short power cycle—either unplugging the PC or switching off the PSU for a few minutes. The most likely causes appear to be a cold boot issue or failing capacitors on the motherboard or power supply unit, though he hasn't replaced the PSU yet. Any suggestions or similar experiences would be appreciated.
Consider altering the boot setting in the BIOS from UEFI to Legacy mode. I've experienced four machines that seemed to have failed drives, but flipping the boot configuration resolved the problem. These devices date back to 2009-2013, coinciding with the release of Rampage IV. Since these aren't my regular workhorses, I'm not overly concerned about startup speed. You might want to explore further if this fixes the issue, but it could help get the PC running smoothly at the moment.
Tried disconnecting the mouse/keeb and other USB ports to check for issues. https://rog.asus.com/forum/showthread.ph...T-ERROR-B4 This was with a Maximus VII, but ASUS uses common codes on their boards. B4 is a USB Hot Plug error; some threads suggest it might be a controller or CMOS battery problem, but removing USB devices is a solid first step.