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When you connect the 4-pin connector to that device (eg. 1. A hard disk, 2. CD/DVD drive, 3. Fan, 4. Accessory ), It will not fire up or Turn-ON, right? The device is causing it, probably damaged or defective.
Disconnect all external connections except power cable and see if the system will power on. If it does, the add back items one at a time till fault is identified. If not here are some items you can check
no post indicators are shown here
if the system has no power indications are all, the replace the power supply 1st as it is the 1st point of failure and the least expensive
Telephone Dell, but first get the unique Dell asset-tag number from the decal on the back of the desktop. With that number, Dell will ship you a set of "System Restore" CD/DVD disks, via overnight courier.
Use those disks to reinstall Windows.
Please let me know if the numlock light responds by pushing the numlock key on the keyboard. If you are using a videocard, please disconnect it and connect the video cable to the integrated video. Make sure you disconnect all the expansion cards. Please let me know if this doesn't work.
You need the C521 recovery disk, from Dell. Set the BIOS to boot from CD and start the system.
If it gives you the option of "Complete Reinstall" or "Repair", choose Complete Reinstall.
If it does not, or if it does not work - i.e., it always reads the disk and tries to maintain as much data as it can, you need to first wipe out the hard drive; there are many "Disk Wipe" utilities out there. I'd suggest using a boot disk such as DBAN (www.dban.org).
- disconnect the hdd and optical drive cables, remove the expansion card, reseat the atx and 12v cable and turn the computer on. if the power led is glowing green connect the devices on by to find what device is causing the no post issue. after the strip down if the power button is still yellow replace the motherboard