Hi all.
I have been lurking here for quite sometime.

I encountered a problem today when i switch on my desktop.
My Desktop was built by my cousin's friend.
This morning when i was using the desktop the screen on my 5 year on CRT Monitor suddenly went black although the CPU is still moving.
Then i press the button on the CPU for about 10 seconds to switch it off.Then i switch the desktop on again.The CPU got light and moving but nothing appeared on the Monitor.
After awhile of trying the screen got back on and everything went as normal until i got "CMOS Checksum Bad" and would not continue to boot to windows it only allowed me to press F1 or F2 to go the CMOS configuration and some other thing. I called up my cousin friend and he told me to go to F1 then select save and exit.He told me after that should have no problem.
Then awhile later i try to switch on the PC again i got the CMOS CheckSum Bad thing again and i press F1 and save and exit.Then everything load as normal again until i got the Windows did not shut down successfully message. Then i go select start windows normally.Then the thing hanged.Cannot press enter at all. Then i switch off using the button on the CPU.
Now i try switching it on again and there is light at the CPU but nothing on the monitor.
So can anyone help me with my problem?
Is it the Monitor spoil or something wrong with the CPU?

PS: Sorry, i am abit long winded