No Video on Boot up - ASUS P5N-E SLI Motherboard

see if you can boot to the Safe mode (F8 at boot, or F12 boot menu, selected HDD, press enter then F8 immediately) see if you get video. If you do, reboot again, on the F8 menu, select Low Resolution or VGA mode (Depending on Windows Version) and see if you have video, if you do then see if you can increase the resolution to the optimal of the monitor (It may be the display settings are too high for the monitor)
If you can boot to the Safe mode but not the VGA mode, the issue is the video driver.
If you have no video in the Safe mode, then the graphics adapter is likely bad

If the mainboard has onboard video, have you tried connecting your monitor to that output..?

Try booting into boot into Enable VGA Mode. When you start your PC press F8 at boot up. If you video doesn't crash in this mode is could possible be either the driver or the video card may have bad memory. I would try enable video mode first, then update the driver, if you are still having problems you then know that the video memory on the video card is bad. Especially if you are seeing lines or discolored blocks outside of the operating system, for example during boot up then it it definitely hardware.

hope it helps

Sounds like your video card is bad if the external display does'nt show video either.

If the laptop appears to boot up and you can't see an image on the screen, you need to determine if the screen is faulty or the video card.
Connect an external monitor to the laptop's external video port, power up the monitor first and then boot up the laprop. If you get a normal video image on the monitor then the video card is OK and the fault is with the LCD screen.
If you don't get an image or POST information, then the LCD screen could be faulty or the laptop didn't boot up.
Please get back to me with the results of your tests and any error messages etc. so I can advise further.

1 long and 2 short is video adapter / card failure. Replace the video card.

While booting press F8 and pick the option "enable VGA Mode"

This shoud get you back to a place to re-enable the video. Also what wehre you trying to fix by disabling the video?

omakl

As soon as you turn on the PC press the Pause screen. Try to allow some of the boot screen to load before pausing it. See if you loose video while in pause. If you do loose video display, than the issue is either the video card or overheating. Check CPU fan. (Clean interior of PC). Remove & re-seat the video card. On page 28 of your manual you can only use certain video cards as listed. When all else has failed clear your cmos pg. 29.
http://www.foxconnchannel.com/product/Motherboards/detail_overview.aspx?ID=en-us0000066

To test your memory click this link. http://www.memtest.org/
Scroll down to
** Memtest86+ V2.01 (21/02/2008) **

Download - Pre-Compiled Bootable ISO (.zip) or Download - Pre-Compiled package for Floppy (DOS - Win).

Good luck!

Mike