Having problems with your Dell Dimension 8400 PC Desktop ?

Computer suddeny refused to turn on/boot whatsoever

\015 About a month ago I installed a third hard drive into my four year old Dell Dimension 8400 and the pc went from functional to completely non-functional instantly. When I plug it all back in and try to turn it on absolutely nothing happens. The power button feels the same, but it does not light up. No fans move. Like I said, absolutely nothing happens. I vacuumed out some dust bunnies while the case was open, but nothing else was out of the ordinary. The actual hard drive install can't be the issue because I reversed the changes right away to see if it would work and it didn't change anything. I checked all connections to no avail. I disconnected everything from the motherboard except for the two power supply connectors, the processor, and the power button cable but nothing changed. It still would not boot. I haven't got any beep codes because it doesn't seem to even start the boot process, none of the four motherboard diagnostic lights turn on at all, and I checked all the capacitors on the motherboard and found nothing suspicious whatsoever.I decided the power supply may be bad so I bought a replacement Dell model on ebay (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=200317998769) and that's when things got even more interesting. Now with the new power supply as soon as I plug it into the wall my CPU & video card fans go nuts, spinning much faster than I have ever heard them spin before, the power button glows orange, and still the power button clicks mechanically like it is supposed to but nothing changes. The fans just keep blowing like crazy and the thing still refuses to boot.Did I buy an incompatible power supply? Nothing I can find online tells me that, but it seems possible to me. For the record, my original ps is a Dell F4284 (model L350N-00) and the new one is a Dell C4849 (model N350N-00). I emailed the seller about my problems and he suspected the power supply to be bad so he sent me a different one. I have tried the new one he sent me but it does the same as the first new one.I'm thinking if my motherboard is bad why would my old power supply cause nothing to happen whatsoever (except for the power LED on the motherboard near the 24-pin connector to light green) and the new power supply cause the weird results listed in the above paragraph? Did my ps and motherboard both go bad at once for presumably no reason? That doesn't seem very likely but I'm running out of options.Do I have to replace my motherboard? Unfortunately the cheapest one I have found for my Dell so far is $90... Please help!\015

Answers :

It sounds like the hardrive you installed overloaded the system and cause a low power operation on the computer the motherboard may be bad because of this as well as anyparts that were connected to it i have had this happen to me before and well i know it sucks but your best bet is to just buy a new computer and make sure you power supply can handle extra parts...
As long as both of the power supplies has the same or higher wattage then it should be ok. From the model numbers it looks like you got 350Watts which is a little low but if it matches your old one then is ok. Budget PC is 300W and Basic Business PC is 400W. Make sure the 4-pin 12V is also connected correctly and that's about it for the motherboard. Unless the extra power needed for the third hard drive could not be supplied enough by the PS...Did you try it taking one hard drive out at a time and see if that make a difference? Since that was the last thing done before the problems I would zoom in on that before investing in a new motherboard and more powerful power supply. Let me know how it goes.
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