Drive light comes on and off but not power up and black screen
If you're talking about the light blinking on the CD/DVD drive when you try to turn on your system .. that's because it's getting enough power for the disc drive to run it's onboard boot circuits. Does not mean that the rest of the system is getting the power it needs .. could very well be that your main Power Supply Unit (psu) is going out.
Note :: PSU's are one of the most frequently replaced items in desktop systems. Many new systems come under-powered and upgrades that place more demand on the power supply will stress minimal psu units.
When I replace them, if at all possible, I put in stronger ones so they do not stress and wear out as quickly.
If you're talking about the actual Power LED on the computer blinking, its most likely an error. The 8200 has a set of LEDs on the back to indicate various failure codes. You didn't mention beeping so its not a beep code, which exists as well. If any light other than the CD/DVD disc light is what you were talking about, please clarify or visit [Link shown below] :: the Dimension 8200 pdf manual link, codes in it.
QwkLink1
SOURCE: Dell dimension 3000. Just Black Screen no Windows XP.
From your description, you were able to boot the machine properly in Safe Mode. While in Safe Mode, change the video resolution to the lowest possible (color depth does not matter at this point). You should also check that you are configured for single monitor operation if your video card supports multiple monitors. Reboot the machine normally. If all goes well, you can readjust your video settings for a higher resolution again.
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