You can check the diagnostic LEDs with this information:
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell
If you are getting 123 LEDs and a green/blue power LED the issue is most likely the hard disk drive, boot to the resource CD and run diags on the HDD
Hello, doing a "last known good
configuration" Works most of the time. Here is how to do it:
1. Make sure your computer is powered down.
2. Turn your computer on and immediately
start pressing F8 on your keyboard repeatedly until you see a black screen with white writing that gives you a list of boot
options.
3. Use the down arrow on your keyboard to
select the Last Known Good Configuration (Advanced) option.
4. Press Enter on your keyboard
and cross your fingers.
Good Luck!
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