Question Pc turns on but no display,keyboard lights or mouse after installing new parts

[sheshayo]

Yesterday i’ve bought a ryzen 5 3600,24gb ram and a b450m a ii.i’ve installed the new parts i turned on the pc and it booted up everything seemed fine but i forgot to connect the speakers cable on the motherboard.i turned off the pc,opened the case and connect the cable,when i tried to turn it on the pc turns on but the display is black and the keyboard and mouse doesn’t have any light as it usually has.

Here are my full specs
CPU-ryzen 5 3600
GPU-gtx 1060 3gb
MOTHERBOARD-asus prime b450m a ii
RAM-24gb ram
PSU-seasonic 620w

 

[rgd1101]

disconnect the speaker cable

 

[Lutfij]

24gb ram
That is a weird load out for ram. Mind sharing how that 24GB's is on that platform?

PSU-seasonic 620w
How old is this unit? Are you working with the M12II or the S12II?

i’ve bought a ryzen 5 3600,24gb ram and a b450m a ii
Might want to parse two sets of specs. One for before the upgrade and one for after the upgrade. i.e, two sets of this;
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:

 

[sheshayo]

Hi,the psu is the M12II

 

[sheshayo]

Before:
CPU: i3 4160
Motherboard:h81m-k
Ram:12gb(4 and 8)
Ssd:120gb kingston
hdd:1tb
gpu:gtx 1060 3gb msi
psu:m12ii




After:
CPU: ryzen 5 3600
Motherboard:asus b450m a II
Ram:24gb(16 and 8)
Ssd:120gb kingston
hdd:1tb
gpu:gtx 1060 3gb msi
psu:m12ii

 

[GarrettL]

You should be able to get into the bios but I'd be surprised f the system would boot into Windows. Did you reload Windows after changing CPU and motherboard?

What RAM are you using? It must be DDR4.

 

[sheshayo]

nope,last night was working really good

 

[sheshayo]

yes it is ddr4,last night i went in bios and changed fclk frequency or something like that from auto to 3000,because my ram is 3200 and in task manager it was using like 2000mhz.could this cause it?

 

[GarrettL]

nope,last night was working really good

Two things.

Never mis-match RAM. Always install them in matched pairs such as 2 x 8GB.

You went from and Intel platform to an AMD platform and you did not reload Windows? If so you need to re-install Windows. If you can get it to boot I'd back up all imprtant files then a fresh install.