|mmm Does it light up - as in any indicator lights/leds showing? Is there any noise of fans, hard drive? Is there "anything" on the screen - the Dell splash screen at least?|
And - very basic I know, but - are you sure the mains/ac outlet is OK; as in there are volts on it? Also have you tried another power cord? Logically if there is some evidence of activity - however sparse/limited - then one can presume the mains outlet/power cord is OK?