Question New ram. Pc turns on no display.

kurulay5

Honorable
Sep 17, 2018
125
1
10,715
So I tried to install new ram into my friends pc.
I turned the pc off and switched the PSU switch off then I took out the old ram then added in the new ram. From one stick to two.
The pc turns on with all its LEDs however the monitor shows no display and the LEDs on the keyboard and mouse don't turn on.
I have tried to restart the bios by taking the battery out and I've tried to reinstall my old ram however it's still showing no display.
What do I do?
I've tried to install the ram by using one at a time and I tried to install the ram the other way round and it doesn't work. Please help.