You have a "No POST" situation. Check the power button, more than likely it is not a solid green.
Your computer is probably old enough to have lifetime troubleshooting support from Dell, if you are the registered owner. They won't replace any parts (but they should help you figure out exactly what _is_ wrong).
I will say that unless you are prepared to do the work yourself, repairing the system will cost nearly as much as buying a new (and much faster) computer. With the economy the way it is, there are some great deals to be had. You'll only need a box, so check out outlets like dellauctions.com.
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
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Make sure that you connected all of the required power connectors on to the motherboard. Depending on you motherboard, there might be a 4 pin connector next to the CPU that supplies extra power to the CPU. Also if you have a dedicated video card (not integrated to the motherboard), it may need more power as higher end video cards need direct power from the power supply. Also make sure you have your monitor connected correctly. With that said, I have a feeling that it is the 4 pin CPU connector since it is easy to miss.
This sounds like either a power supply issue or a CPU fan issue to me. You say you hear a fan spinning loudly. Try and determine which fan it is. Take the left side panel off your case and start your game. When the fan gets loud identify which one it is. It's possible that the heatsink on your CPU is clogged up (pet dander, dust, smoke, etc.) and needs to be blown out. Get a can of compressed air and try blowing out the inside of your PC. It's possible your CPU/video card/power supply is just getting too hot.
you have to test the processor functions. therefore use post diagnostic card via PCI or PCIX or USB for the check hexa codes, if you show codes the processor ,ay be ok, also have to check the code function by card manual. and replace the unit that failure.
I have a small business where I have worked on PCs for the past 14 years. I have had some of my clients that have brought me a few of these Dell 8400 to work on with the same problem. Will not boot and loop the start up, along with sounding like a leaf blower. After much trial and error i.e. Heat sink,cooling fan, power supply and motherboards. The first one I worked with by changing the heat sink, worked for about a week, then started doing the same thing. Replaced the Power supply with no results, same issue. Next was the Motherboard, still same issue. Last I pulled the processor out and found that the processor had over-heated and was damaged. In all I had well over $500.00 dollars invested and countless hours. Still the machine did not work, and still needed more work. Since this time I have had a few more of these machines cross my path. My suggestion is to scrap it and purchase a new PC. This is not one of Dell's better designs, and there is a tech issue from Dell related to this problem with the heatsink and the machine itself in the tech support on the Dell site. It states that they had a bad batch of heatsinks, but only replaced them under warranty.
Salvage what you can and build or have someone build you a clone.
Yes. It can be replaced. Try to check which fan is making that sound. Do you have a laptop or a PC? On a PC, there are 3 standard fans inside it. one for the CPU, one for the power supply and one for the computer casing fan as well. It depends on which of those fans it's coming from. On a laptop, some laptops' fans actually makes a loud noise which is common but there is a way that it could be lessened but it might slow down your pc and it might overheat it as well. The loud noise on the fans of a laptop actually indicates that it's trying to cool down the system. If it doesn't stop the loud noise, it could indicate a problem switching the fans back to normal and would just continue to spin fast. Try to contact your PC tech for further diagnostics on the laptops fan to indicate if the problem is with the fan or the mainboard as well.