Monitor gives me blackscreen when connecting to my vga

SonicSkywalker

Prominent
Jul 27, 2017
38
0
540
I was recently replaced my processor with a new one and adds more ram,when i try to turn it on (connected my monitor to my GT 630's vga port) it gives me blackscreen,i've tried the removing cmos for a couple of minutes fix,still doesnt work
Any help? Or do i need to buy a new graphic card?
Im just 15 y.o student so i can't afford the recent graphic cards

Update:tried using HDMI,still not working
 
Solution
Power down and disconnect the PC from the wall socket. Then, try removing the button cell CMOS battery for 15 seconds. Replace the battery and power up.

SonicSkywalker

Prominent
Jul 27, 2017
38
0
540

before:
Pentium Dual Core E5200 2.5ghz
2GB of DDR2 RAM
GT 630

after:
Core2Duo e8400
4GB of DDR2 RAM
GT 630

I already had this problem before i upgrade
Im using onboard aspire m1800 mobo

And yes i've double checked if the parts were compatible