B550m Pro4(P3.40) with Ryzen 5500GT doesn't POST

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   Hi all.
First time building PC.
Got B550m Pro4 motherboard with sticker BIOS version P3.40 and Ryzen 5 5500GT (Cezanne), with integrated graphics card. CPU should be supported, as per CPU support page

i got thermaltake toughpower sfx 850w as my PSU. CPU is connected using CPU cable.

got only RAM and CPU on the board. some SATA cables, connected to motherboard, disconnected on other end.

when powering on, CPU and DRAM lights turn on, then off, after what VGA and BOOT lights turn on and don't turn off.

tried both with and without HDMI cable connected. tried removing CMOS battery, waiting for 5 minutes, putting it back again.

please help me understand what might be the issue and how to fix it.

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chekh Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 23 hours 11 minutes ago Status: Offline Points: 20	Post Options Post Reply Quote chekh Report Post Thanks(0) Quote Reply Topic: B550m Pro4(P3.40) with Ryzen 5500GT doesn't POST Posted: 22 hours 56 minutes ago at 8:51am
	Hi all. First time building PC. Got B550m Pro4 motherboard with sticker BIOS version P3.40 and Ryzen 5 5500GT (Cezanne), with integrated graphics card. CPU should be supported, as per CPU support page i got thermaltake toughpower sfx 850w as my PSU. CPU is connected using CPU cable. got only RAM and CPU on the board. some SATA cables, connected to motherboard, disconnected on other end. when powering on, CPU and DRAM lights turn on, then off, after what VGA and BOOT lights turn on and don't turn off. tried both with and without HDMI cable connected. tried removing CMOS battery, waiting for 5 minutes, putting it back again. please help me understand what might be the issue and how to fix it.