The computer keeps ringing for 30 seconds, a total of 1 time, "Please check for any new messages".

This is usually BBS, that is, the SMS prompt tone of the forum.

Or you accidentally set the QQ message prompt tone,

If restarting the computer doesn't help, please check the startup items of the computer. If there is an optimization master, it will be very simple. Open System Optimization on the left side of Optimizer, and then click Start Speed Optimization to check whether there are any suspicious startup items. If Optimizer is not installed, click the Start icon on the desktop, then click Run, then enter msconfig, a window pops up, and then click Start to view the startup project. If you are not sure, you can check the startup project.

If the problem persists, please check the startup project again as above.

If it is found that there are startup items that cannot be cleared, which may be malware, then there are only two methods, 1. Antivirus and 2. Reinstall the system.