[SOLVED] Black screen on booting

Hi,

I have successfully
installed Ubuntu mate 15.04 on my Raspberry Pi 2, i am using Class 4
micros SD card [8GB], reboot & shutdown working fine. While
switch on the system after some ‘hours’ its showing black screen only
[no rainbow screen], no booting. The Red & Green LED on Rpi2 are
continuously burning. When I press the Ctrl+Alt+Del key continuously
[i.e. more than 15times], its showing the rainbow screen and booting
normally. Why its happening? In the initial version of Ubuntu mate
its not happened. Is there any solution?
-Jay

Hi all,

I gt the solution… its a problem of my SD Card… some quality issue on that SD Card… Now i changed & its working fine… thanks for your support…

-Jay