I need some help. Since yesterday my nms 8250 does not work properly anymore.
It starts up with the msx logo and then the screen goes black.
This machine is pretty modified (512Kb intern, 2+ roms, F4 latch, V9958 and third internal slot) but never had any problems before.
It all started after I put in the MMC drive of sharksym in slot 3.1. I was curious what would happen as it was not supported for expanded slots.
This screwed up my msx totally as it does not start properly anymore
However if I put a space manbow in a slot I can still play it normally.
I already checked my bios rom and it is still the same, tried normal msx2 roms same effect.
Am I the first to have this behavior on msx? or can this be solved in any way?
Hope that some one can help me with this machine

because a ROM game work try with a game in floppy if your MSX boot the game your MSX is ok
check the internal battery back-up remove it and try boot
if color 1,1,1 and set screen you have black screen init !! try change color by shift F1

Some roms are doing this sometimes.
Try to remove or unplag the battery for 30 minutes and start the MSX without the cartridges. If you see the logo that means the eprom had a glich from the cartridge, and plug the battery back on.

Please do not connect or disconect any cartridges from MSX with the Power ON.
If the problem persist, See if the floppy drive lights up and try to lsten the beep sound on the screen.
Some MSX units don't have a beep sound but some have if you turn on the volume of your screen.
That will be a good idication that the main ROM works fine.
Run this program in basic BLINDLY.
10 CLS
20 SCREEN 1,1,1
30 COLOR 15,4,4
40 LIST
50 END
RUN
This should bring the colors back to normal.

thanks all for the good advice. Indeed the colors where wrong. Probably due to the hang of the system (it was black when I turned it off) and then the Shift-F1 brought the normal colors back. Never had this before

Once done, type SET SCREEN [RETURN] to make these your default settings. Normally, when my battery's gone out, I always do this:
SCREEN 0,0,0,1,0,0
Ok
WIDTH 80
Ok
SET PROMPT "files"
files
COLOR 15,0,0
files
KEY OFF
files
SET SCREEN
files
DEF USR=0: A=USR(0)

And behold

Quote:

thanks all for the good advice. Indeed the colors where wrong. Probably due to the hang of the system (it was black when I turned it off) and then the Shift-F1 brought the normal colors back. Never had this before

The very first time I was at the MSX fair in Zandvoort as a standholder, back in '92 or '93, I complelety freaked out when, after one of the many power dips, my MSX booted in complelety weird colors: yellow/red/white instead of the usual blue/black/white. I was ready to slam some heads and demand a new MSX when one of my fellow booth holders stepped up and entered the magical command

SET TITLE "",0

(or was it ,1?) and pushed the reset button. There haven't been many occasions on which I've felt more stupid

(And just for fun, try SET TITLE "Hello!",3)

then backup battery is "little out" you have strange parameter in sram of clockchip when you start MSX
if you remove backup battery MSX work but default parameter
if you have gouda SCSI you lost parameter because is saved into clockchip sram
you can make autoexec.bas with all parameter screen , color , with , prompt ( and joke set password !! )

Please note, that you can use SET PROMPT or SET PASSWORD or SET TITLE, but you can't use them at a same time.