My inspiron1720 was OK for years with XPpro and Ubuntu. I stripped machine and re assembled it.
Now it will boot(by default, keys untouched) into linux, and displays ok on screen, but the screen is black with the backlight off until just before the NVIDA spalsh screen shows 30 seconds after power on.
There is nothing on display before then, not even the BIOS progress bar. If I use F2, or F12, there is no screen display.
If I plug in an external monitor, it all works OK on the external screen, and I can boot into windows ok. the progress bar, F2, F12 all ok on external screen. Only linux displays on laptop.
I have replaced bios A09. I have replaced XPpro with W7. Replaces Ubuntu with PoinLinux. All same.
\it is asif the backlight is switched on by the video drivers and this is not occuring at the right time. All video drivers replaced.
However blist ? (press 'd' when powering up) works fine.
Help please, this has been driving me crazy for 2 weeks now.