Windows XP won't start

A b110? Oh wow, those are OLD!!! You may try to go INTO Safe Mode. It\'s going INTO safe mode because it\'s trying to tell you that the operating system is corrupted and for you to FIX IT

If you have a short display of the devices and the blue screen flashes when you get to windows and shuts down ..than it is a hard disk issue ..God to bios and disable the ahci function for the hard disk bus..and let it run on ide compatible or sata as ide..This is happening when you have a hard disk on sata with ahci on ..and you do not have drivers in the system ..
But if there is no start at all ..it is a different cause and probably the video card damaged if it says no signal ..
Anyway check them all one by one ..cpu fan ..hard disk in and out ..(see if you can boot to bios ) ..and ram memory ..remove tehm and place back ..one by one to spot a potential harmed one ..

Flashing green power light indicates that the computer is in a Windows Standby power-saving state.

try this:

Power the PC off, open the case cover, remove/reseat the video card in the slot.
* Power the PC off
* Disconnect the PC power cord from the rear of the PC
* Remove the computer cover
* Move the RTCRST (Clear CMOS) jumper from pins 1/2 and place it on pins 2/3
* Press the PC power button
* Move the jumper back to pins 1/2
* Remove/reseat the video card in the slot
* Replace the power cord and cover and then power the PC on

Hope it helps

Unplug your computer, wait 30 minutes, plug it back in and try again.

If it still doesn't work, it's got a serious problem. If it isn't under warranty with DELL any longer, take it to a reputable repair facility.

Bios password is reset via jumper on the motherboard.
http://support.dell.com/support/edocs/systems/dim1100/en/SM/syssetup.htm#wp1054153

Do you have any device drivers loaded on your system that may be interfering? Such as ANYDVD or some other app? Does this happen with data DVD's as well as movies?

Have you tried starting your DVD player application and then inserting the disk into the drive?

One thng you may want to try is going into device manager and deleting all IDE devices, then deleting the IDE controllers themselves and rebooting. This should allow Windows XP (I assume it is XP) to re-recognize and re-initialize the hardware. Then you may want to try re-installing the motherboard chipset drivers (there should be a driver disk that came with your machine, hopefully) just to make sure they are all in good shape.

The fatel error is cause by memory/ and or CPU giveing out if the unit is under warrenty then I would suggest having them diagnose it , if its not then purchase some memory with the same spec's and try reloading again.

Your Power Supply is no good, you are going to have to get it replaced. Once you get it replaced everything should be fine.

Your Power supply is bad--you will need to replace it.