Question about the 4 x 2MB sdram

[funos]

What happens when one or all 4 of them go bad?
The games will still run and get glitched graphics?

I'm asking because:
1. at boot, the dreamcast logo has 2 flickering letters.
2. when I enter the settings menu, the console crashes.
3. It doesn't run any games.
4. gdemu displays the game list, but when i select a game, the console restarts back to gdmenu.
5. the audio has a strong buzz.

This happened after connecting the console to a faulty monitor through vga. That monitor killed 2 consoles. I was able to fix one, but I have no idea where to start on this one...

gdemu, power supply, disc drive, yamaha ic and its ram are tested on another console and are working.
I have dumped the bios and it's identical to v1.01d

[funos]

I've placed DC Checker in folder 01 and it booted!
But I get the errors in the pictures. Any help with that?
MEM0204 is IC102 or IC103?
Or maybe MEM0201+MEM0203=IC102 and MEM0202+MEM0204=IC103 ???