The CPU indicator activates during sleep state on a computer.
The CPU indicator activates during sleep state on a computer.
Hi everyone, I’ve noticed my PC fans are loud and the CPU gets quite hot—up to 35°C—when I put it into sleep mode. It usually happens a few minutes after sleep starts. I’ve updated the BIOS and done most of the standard setup, but I’m still trying to figure out if this is normal or a problem. My build specs are: motherboard MSI PRO Z790-A, CPU Intel Core i7-14700K, RAM Crucial DDR5 Pro (32GB), GPU 4070, and a Gigabyte Eagle OC. Let me know your thoughts!
35c temps dans les BIOS/IDLE sous Windows sont normaux. Cela ne représente pas de chaleur excessive. Sur un processeur 14e génération Intel, une température de 95°C ou plus est considérée comme élevée. Concernant l'indicateur lumineux qui s'allume au démarrage, il est inhabituel. Si le système fonctionne correctement sans autres problèmes, cela pourrait être lié à la détection d'erreurs ou au signal du voyant de débogage. Si ce dernier empêche le réveil du PC en veille, la situation change. Est-ce que l'indicateur concerne le CPU ou le VGA ? Le PC réagit-il toujours au réveil depuis le mode veille ?
I made an error with the temperature readings. The PC won’t wake from sleep once the light is activated. I have to hold the power button to shut it down and then press it again to turn it back on. I’m sure the CPU indicator is the cause, and I can’t start it normally during this problem.
In BIOS → Advanced → Power Management, turn on ErP S4+S5 to prevent USB/PCIe devices from activating the board. In Windows → Device Manager, remove the option to wake the computer when connected to network or USB ports. Ensure Intel ME and chipset drivers are up to date, as they manage many sleep state changes. On certain Z790 boards, fans may spin up again after sleep because the board doesn’t fully reach S3—it behaves more like a modern standby. If this bothers you, skip hybrid sleep and opt for hibernate or shutdown instead. No hardware issue, just firmware behavior.
Here are the settings you selected. Let me confirm they match what you intended.
Yes, that’s precisely correct. Enabling ErP Ready plus USB standby power both switched on ensures devices don’t disturb the board. Disabling the Windows Device Manager option for your NIC/USB hubs will give your Z790 the best sleep cycles. You’ve got the BIOS configuration right—everything looks good.
Updated: I left my PC in sleep, but it didn’t wake up unexpectedly. Still, it won’t come out of sleep automatically. When I try to turn it on, the CPU indicator stays lit and the fans spin fast, so I have to power it down completely.
It seems you've resolved the random wake problem, which is a positive outcome. The resume failure and stuck CPU LED on Z790 models are separate issues. Consider these steps: In BIOS → Advanced → ACPI Settings, adjust ACPI Suspend State to S3 if available. Some boards use modern standby (S0ix), which can cause resume failures—upgrade to the latest Intel ME firmware and chipset drivers. On Windows, disable Hybrid Sleep and Fast Startup in Power Options and try plain S3 sleep; if it still doesn’t work, many users opt for Hibernate instead of Sleep on 13th/14th gen systems with Z790 support. No hardware is faulty; the problem lies in firmware/standby management. If Hibernate functions well, that’s a solid workaround until a future BIOS update addresses the issue.
The BIOS isn't supporting those ACPI settings even after updating the Intel ME firmware. I'll just rely on hibernate for now. Thanks!