123 lights on the front are showing, the power light is green and the only other things is 3 beeps from the MB
Not sure on the beep side but this is what the lights code refer too.
Ensure that all hard drive and CD/DVD drive cables are properly connected to the system board.
If there is an error message on the screen identifying a problem with a device (such as the floppy drive or hard drive), check the device to make sure it is functioning properly.
If the operating system is attempting to boot from a device (such as the floppy drive or CD/DVD drive); check system setup to ensure the boot sequence is correct for the devices installed on your computer.
If the problem persists, contact Dell (see "Contacting Dell" in your Owner's Manual).
SOURCE: dell dimension 8100 diagnostic lights
Green Green Green amber is a start of "POV" whatever this stands for. Dells description is "System activity subsequent to video initalization" I would start with video card replacement,
SOURCE: beeps, wont boot up
Most of the time when it beeps, and there is nothing show on the computer screen, it is a RAM problem. A stick of ram may have gone bad. If you have two sticks of ram in the computer, you can try to remove one stick at a time to see which one might have gone bad.
SOURCE: DELL XPS 210 WONT POWER ON
The power supply may have gone south or there may be an overload on the motherboard, memory or one of the drives. Unplug one drive and restart, then another and another. Remove the memory and retry. If still nothing, try another supply. If still nothing, you may need professional help.
SOURCE: My xps 420 pc desktop wont boot. Shut it down last
Try and reset your CMOS and see if it helps.
If you're not sure how, then unplug the power cable from your PC, then take off the side panel, on the motherboard is a set of 2 or 3 pins to Clear the CMOS (reset the BIOS) all boards are different, so there is no set location for the CMOS pins, if you're unsure, just remove the battery from the motherboard for about 30 seconds, then replace it ("+" facing up)
But you need to make sure your PS is not plugged into any external power source while you're doing this or you risk deleting your BIOS
Hope this helps in some way.
SOURCE: when pluged into outlet fans spins and doesnt stop, wont boot
Fan spinning hard is usually a CPU issue.
If you've made any hardware changes to your computer, undo them.
This happened to me when I was trying to upgrade my Processor (CPU) and I had the wrong kind.
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