Ubuntu won't boot can anyone help?

Ubuntu 7.04 Feisty Fawn won't boot. I have a dual boot setup.

When it asks to boot it shows

Ubuntu, kernel 2.6.20-15-generic
Ubuntu, kernel 2.6.20-15-generic (recovery mode)
Ubuntu, memtest86+
Other operating systems:
Microsoft Windows Xp Professional

I click Ubuntu, kernel 2.6.20-15-generic then it says

Kernel alive
kernel direct mapping tables up to 100000000 @ 8000-d000

then my monitor says no signal my keyboard does not power on, nor my mouse

I can boot when i go into recovery mode and type startx. Also when I first installed ubuntu the live cd did not want to start. I had to change the vga output from 1920 x 1080 to 1600 x 1200 I have a gateway 21 inch widescreen monitor that does 1680 x 1050 resolution.

my computer is a

AMD 3200+ 2.04ghz 1mb cache
DFI Lanparty nf3 250gb newest revision
ati x800xt all in wonder
1gb of OCZ Platinum edition ram
74 Gig western digital Raptor
120 Gig western digital drive
Logitec g5 mouse and logitech g15 keyboard
Gateway 21" Widescreen 1680 x 1050