Hi Sabastian L,
The best thing I can recommend is to "call" Dell Tech support. It sounds like you have tried just about everything you can, I think you are right something is gone bad.

Good Luck,

Marvin P

XPS B800r
512MB Ram
Windows XP (2/1/02)
&
8200 1.8G
512MB Ram
XP
&
Truck Vanity Plate "Dell4Me" (Maine)

hi,

it's me again. I've even noticed, something has changed. Now the front panel lights are off, too. but cd-light is on, and cd-rom gets power (can be opened)

Hello! I have a Dell Dimension 4100 (originally with Wins ME, upgraded to Wins XP).
I dont tknow that much about the tech end of this, but if this helps you at all. Mine is about 14 mons. old. The only light on at front of case is the vertical light within the power button. That`s the only light that eluminates, constantly.
When I open the CD-ROM drive the light for it comes on, when I close the drawer, it flashes. At the sametime, the small light (under power button) flashes as well. Both of these lights stops when drawer is closed.
On mine, everything is running fine.

Did you check your monitor cable? It says "check video cable" so it might not be connected or the pins my have been damaged. Also the video card may be bad. Do you know what kind of video card you have? What parts did you get replaced and who replaced them...Dell? For the lights on the front of the case, the one on the power button should be on all the time. The small light shows your harddrive activity, if its not flashing its ok, it just means its not accessing the harddrive.

Dimension 4100 PIII 1Ghz
XP PRO
19'' P991 Trinitron
384MB SDRAM
Gainward Geforce 4 Ti4200 128MB w/ VIVO
Turtle Beach Santa Cruz Sound Card
Logitech Z-560 (4.1 400 watts THX Speakers)
200 Watt Dell PSU
Microsoft IntelliMouse Optical
Logitech Internet Navigator Keyboard
40GB 7200RPM Hard Drive
LG 8x/4x/32x CD-RW
NEC 12x DVD ROM
Microsoft IntelliMouse Optical
Logitech Internet Navigator Keyboard

Hi,
I changed the monitor too. The video card is TNT2, but I replaced it with an old PCI card laying around here..but coudnt help too. I just wanted to know if the flackering light on the mainboard could be the cause of a broken power supply, or if anyone knows what the fault can be.

thanks.

When you upgraded to winXP did you also flash your BIOS? Most of the dell systems require a flash to make everything work properly

No diagnostic lights on the back mean you are not starting POST. first thing pull the modem and try to start the sys.
If it still does not work, pull everything off the motherboard except the processor and the connector for the front connector.
turn on the sys and listen for beeps
If you get beeps start adding back your components one at a time until you find the component causing the problem
If no beeps your power supply or motherboard is probably no good

Hello supersurfr! Are you asking me, if I did a flash of the BIOS, when I upgraded to Wins XP. No I didn`t.
I upgraded back in Mar/02, using full version of Wins XP Pro. Did reformat and clean install.
The only thing I had to do after upgrading was get updated driver for the Mic. keyboard.
Also, recently added more memory. Originally had 256 MB SDRAM, added another 256MB. Although it was basically working fine with the origianl 256MB. Since 256 is minimum for XP, thought (from what I`ve read here) this would help to improve system.
I`ve had no problems since installing XP Pro.

Dell Dimension 4100, Intel Pent. 111 at 1GHz, 40GB Ultra ATA, Dell 19" M991,
32MB Nvidia GeForce2 MX Graphics card, 16x DVD-ROMw/software decoder, LG CD-RW CED 8120B 12x/8x/32x - 2nd bay.