Same problem, the screen blinks on boot
I have a problem similar (or the same) as the one in the first post.
I have a Samsung Galaxy 5/Corby, I5500, the operator is TIM (Italy). I've rooted it, then installed MAD Manager, installed ClockWorkMOD and flashed the last version of CyanogenMod. It worked quite good, the only thing that didn't work was wireless tethering. However, it was very slow, because of the small RAM. So I decided to shrink the main SD partition and add a little SWAP, then enable the apposite option in the Advanced tab in Settings. But, after a reboot, it din't swapon the partition. So I enabled ADB and (throught Linux) opened a root shell and ran "swapon /dev/block/xxxxxx#p#". It worked. But I didn't want to open an adb shell or a terminal after every reboot to enable swap. I googled a bit, then read somewhere that a /system/etc/init.d script might have done the trick. So I made a little script with my PC:
swapon /dev/block/mmcblk0p2 || echo "Unable to enable swap, please insert the SD card."
sysctl -w vm.swappiness=60;
then pushed it into /system/etc/init.d/83swapon
The filesystem is read-only
I remounted /system in rw, and tried again.
I removed Apollo, a media player included with the rom I downloaded, and tried again, getting again "no space...".
After a bit of hacking I decided to put the script into /data, then make it executable and make a symlink in init.d that points to it.
I didn't manage to remounte read-only /system, so I didn't remount it at all.
I rebooted the phone to check that it was working, but the screen started blinking. The only thing I was able to do was removing the battery then starting it in download mode by pressing Volume down, Center and Power.
I've made a video: youtu.be/SM7dXfCa4dI
I tried to flash the stock Samsung ROM using ODIN, but ODIN makes it reboot and blink again. I don't know what to do, the link in the fourth answer doesn't work... can someone reupload that file or suggest me a better solution?