Monitor turns off at start install Ubnuntu 10.04

[IT07]

hey other ubuntu-users,

Can you help me with some very irritating problem?
the problem is: my monitor turns off when I want to install ubuntu! ?!?!?!?!
It's really ******* me off right now...

Explanation:
right now, I'm using Ubuntu 9.10, and I want to install
Ubuntu 10.04, so I made a bootable usb, and i booted my computer
on this usb. so far, there's nothing going wrong.
First, I had to select a language for Ubuntu, so I did that.
After that, I had to choose want i want to do with ubuntu,
so I selected (of course) "install Ubuntu".
Then i got the loading screen, and after a short time,
suddenly my monitor turns off!

Could you please help me with this annoying problem?
thanks in advance.

grtz.

(PS: sorry, my English is not so good, I hope you understand anything of what is above this text...)

[buger]

Just burned a copy of 10.04 today to put on another computer and guess what, I'm getting the same thing. Monitor turns off like it's getting no signal from the motherboard during the install.