"The monitor screen becomes black
when I perforn that "startx" above.
Is there a way to view both tv & monitor ?"
In short, yes. But you won't be able to see exactly the same thing on both screens. It's not like windoze. You have to use twin view or assign each output as a virtual desktop. So TwinView or 2 virtual desktops are your only options (to use both at the same time that is).
For the second problem, "Ctrl+ALT+Backspace" out of it. It's dirty, but it works.
Gentoo Linux-64, AMD64 Athlon 3200, Asus K8V Deluxe, 1 gig(3200 400mhz) ram, GeForce FX5200 128, HP 400i DVD+R+RW, HP ScanJet 2200c, Epson Stylus C84, JVC DRV3000U (firewire - usb), Kodak CX6330