I will briefly list and describe some codes:
00
(It is necessary to check if the processor is installed correctly and reset CMOS)
0d
(The problem is with the memory, video card, or other devices. You need to reset the CMOS, remove, insert the RAM and video card, and also remove other USB and PCI devices)
01 – 54 (except 0d), 5A – 60
(The problem is with the memory. You need to reinstall the processor and RAM, then reset CMOS. If the problem persists, you need to install only one memory module or use another memory module)
55
(No RAM was found. It is necessary to reinstall the processor and RAM. If the problem persists, you must install only one memory module or use another memory module)
61 – 91
(Error initializing the chipset. You need to reset or clear CMOS)
92 – 99
(The problem applies to PCI-E devices. You must reinstall the PCI-E device or install it in another slot. If the problem persists, you must remove all PCI-E devices or use a different video adapter)
A0 – A7
(The problem is with the IDE or SATA devices. You need to reconnect the IDE and SATA devices. If the problem persists, you need to clear the CMOS and try disconnecting all SATA devices)
b0
(The problem is with the RAM. You need to reinstall the processor and RAM. If the problem persists, you need to install only one memory module or use a different memory module. * For X79 models, you need to install memory in the DDR3 A1, B1, C1 and D1 slots)
b4
(The problem is with USB devices. It is necessary to disconnect all USB devices)
b7
(The problem is with the memory. You need to reinstall the processor and RAM, then reset CMOS. If the problem persists, you need to install only one memory module or use another memory module)
d6
(The video card is not accepted. You need to clear the CMOS and reinstall the video card. If the problem persists, you must install the video card in a different slot or use a different video card)
d7
(Keyboard and mouse not detected. Reconnect keyboard and mouse)
d8
(Wrong password)
Ff
(It is necessary to check if the processor is installed correctly and reset CMOS)
See also my article:
Description of BIOS Beeps