Alert! Previous boot up attempts have failed at [PnP5]."

SOURCE: my dell dimension 8400 bios a03 fails to bootup

You need to reset your bios settings. Open your case and remove the cmos battery for 10 minutes. Caution: unplug all ac plugs before you open your case. put the battery back in and turn it on you should see an error message saying: you need to set system time and date. If you see this then you have successfully reset your bios settings and the defaults should load up. follow the instructions to change your time and date settings and save. reboot and hopefully you can boot up. I hope this works.

SOURCE: my dell dimensions 4600 will not boot

Dont worry.This can be resolved.Goto the BIOS by tapping the F2 key on the restart -Goto the option which says Maintainence>>Event log>>Clear all even logs -Now press F10 to save and exit or press the ESC key just once and Select SAVE and EXIT

SOURCE: [Ithr]checkpoint failure dell 8400 dimension

What can cause this error?

Well, this is the problem since quite a variety of problems can trigger the error.

1: the bios can be malfunctioning (a bios reset or flash can give a solution)
2: the cpu can be malfunctioning (this requires a new cpu)
3: the cpu socket can be failing (this requires a new mb)
4: the problem can be with bad usb sockets
5: even a bad uplink to a usb hub can cause this error to appear.
Did you change your monitor lately? I would chase down the USB things first...that and the monitor seem to trip the trigger...
Hope this get you started- I think you were right on target with the flash of the BIOS-try it again using the BIOS flash downloaded from the dell site...and to run the chipset again...it just might
Good luck my friend, hope this helps, please leave rating, thank you kindly

SOURCE: Can not boot the system

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SOURCE: System will not boot. Get the following:

try checking to see if the processor fan is working if not that will keep your computer from booting up