Question display no signal after Ryzen 5 2700x to Ryzen 7 3900x upgrade

[LaMii]

i just upgraded to a new cpu after and turned on the pc, everything works, all lights are on, all fans are spinning but the monitors don't turn on.
the old cpu does not work anymore so i cant put it back in.

Specs:

• currently ryzen 9 3900x
• rtx 2070 8gb
• 16gb ram
• gigabyte b450m ds3h am4 mATX
• psu 750w
• windows 10 professional64-bit

 

[boju]

Was the Bios updated to F40 or higher?

 

[LaMii]

Was the Bios updated to F40 or higher?

I dont know, sorry

 

[boju]

Most likely the board's Bios is F30.

I suggest taking your PC to a PC store/service centre and get them to check and update Bios if necessary with a 1st/2nd gen CPU.

 

[lynx1021]

What happened to the old CPU? Hard to kill unless they are severely overclocked, overvolted or run without a heat sink.

 

[bioax]

You just need to update your bios to a newer version in order to support the 3rd gen ryzen.

 

[gggplaya]

buy yourself an old athlon 200GE processor, install that and update your bios. Then put the 3900x back in.

Lesson learned, alway update your BIOS of any motherboard before installing a new generation CPU.

 

[Mr.Spock]

no need to buy a new CPU, AMD had a loaner program to update your motherboard to the latest version for 3000 series CPU's.

may be able to do it with proof of purchase. surprised the original CPU is not working? did you reconnect the ATX cable?

 

[mistral_blue]

Also worth a try doing a clear CMOS bios jumper reset (make sure you turn the system off an unplug the power cable first). I built a system that displays similar behaviour on a B450i mobo, everything working but no display, CMOS reset sorts it, it will POST and then you just reconfigure it (something weird with HDMI vs DP) - costs nothing to try this first!!

That said, as the others have already said, it's most likely with it being a 450 mobo that your mobo bios is not up to date enough for latest Ryzen. Some of the more expensive boards allow you to flash the bios without a chip in it (I got SCAN to update my board before they sent it out as I knew it was likely to be incompatible with 3400g). Here's a link to the explanation of your probable issue and AMD processor loaner programme:

https://www.amd.com/en/support/kb/faq/pa-100