I decide to remove the dust from heatsink and fans in PC.
PC hardware and software work fine before that.
Now I do not have a POST. Screan is blank – no cursor.
PSU is fine. Fans are working.
Motherboard makes long bleep in constant rate.
Before that in working system there was one short bleep.
Motherboard is MS-7093 socket 939, CPU is AMD 64 Athlon.
Help is appreciated.