MSX 2 games not working: why?

1) Boot with CTRL key pressed.
2) Contra (Gryzor) needs at least 128K (if you have the right crack). There might even be a 256K version, but I didn't have that in the past. I never heard of Dead or alive.
3) Akin needs 128K as well.
4) And Magnar needs 128K as well.

Which computer do you have? Is it modded? Have you plugged anything into a cartridge slot?
I suspect your computer of being either Japanese (they mostly were released with 64K) or something else with too little ram. To be sure, run those dsk files in openMSX emulating your computer. They'll probably not work there either.

Edit: I checked your screenshots again and I overlooked that they were screenshots from openMSX and not of a real computer. My suspicion seems to be valid. You use a computer with just 64K of ram. Try another MSX. I'd choose a turbo R (Panasonic FS-A1ST or FS-A1GT). They'll do.

He is emulating an FS-A1FX, so indeed only 64k.

hi thanks
1) Gianna sisters: i keep pushed CTRL during the reset of the emulator but after the SUNRISE log, the screen that i linked above appears again

2) yes i'musing an emulator, openMSX...so is it not possible to emulate the others games?

thank you

ah ok, so is it better to set as default machine Panasonic FS-A1GT? in this way all the games will work?

I tried the games:

1) Giana sisters and Akin work perfectly now with this machine. Dead or alive too, but it seems that it is only possible to play in 2 player mode...
2) Magnar: it started now, but i can't go ahead after this screen: https://i.postimg.cc/9Q4tjPX5/Immagine4.png (I loaded disk 1)
3) Contra: doesn't work...i still have this https://postimg.cc/47SxMRMW

thank you

That's the last original MSX to ever leave a factory. It has all on board. RAM, audio, speed, etc.