vldo,
Brohogan is correct.
Your usb cable cannot feed the arduino through DC jack.
It's necessary more than 7 volts to feed arduino using DCjack, or 5volts to feed arduino through 5v/gnd pins.
but its strange, couse when I first connected it the power led whas very weack, but right after Iconnected the parallel only the "L" led lit, and when I tried to connect both, the both leds lit normal. but here next, after I connected only the "usb" the power led whas still normal ... spookie
and when I connected with the giveio the and tried to uplod, than both "L" and power leds binked rappidly and the power led whas weak agein
The power led will lit weakly because your DC voltage from usb is too low.
The L led, and the power led are affected by the parallel port programmer (PPP), that's why they lit a little when the PPP is connected.
Fix your DC power problem, and try again.
But don't forget to put the jumpers in your board, like in this picture: