Can someone please help me

[b41d3r]

I'm not expert but maybe my solved case exposed here could help you :

http://www.amiga.org/forums/showthread.php?t=59748

Bye.

[b41d3r]

I don't know if someone else can give you the keys sequence at startup.
As for me, I recall that there was some fuzz on screen when I pressed a key on keyboard of if clicked with mouse buttons. Is it your case ?
If yes, you're probably in the same situation Iwas.

[b41d3r]

I've just read on wikipedia that amiga 500 + is running a kickstart 2.0 and should be able to recognize the sequence of keys you clicked.
Sounds strange.

[b41d3r]

Yes, I think too you should isolate the problem and try the mouse trick with a connection to tv. Hoping that your mouse has no problem !