Try removing any add on cards and also all the hard drives and cd/dvd drives and see if the symptoms change. It could be a bad component. It may also be a bad motherboard, but removing everything else will help to narrow it down.
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Re: Computer will not powerup
Apparently you're not alone. If you search on your model number and the words "power on," you find lots of discussions, such as this one: http://discuss.pcmag.com/forums/thread/1004375440.aspx
Is that your actual problem? I don't know. If you're not actually getting to the BIOS POST -- power-on self-test -- that's not a good sign.
If you can diagnose the problem accurately, I'd suggest you evaluate what it's worth to you to resurrect that computer especially in light of the potential for future problems and the value-benefit of a new box. I paid $429+tax for an eMachines T5246, which is incredibly strong and big for my needs. If you go the replacement route, just make sure the new computer has an IDE controller card built in (most should, on the motherboard, mostly to support a floppy drive) so you can wire up your old hard drive and get the stuff off of it.
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try removing the front panel make sure the button isnt clogged with dust or disconected failing that it may well be your power supply internal fuse which can be repaird but a trick job if youare not very good with a soldering iron you may get a replacement one on ebay.
pull out everything in the computer except what's required to boot...so any pci cards or video cards (if you have onboard video). you can also try pulling out the ram (while unpowered AND unplugged) and then booting to hear beeps...if you pull the ram out and the computer doesnt make a sound, its probably a bad motherboard and needs to be replaced. if you hear beeps, try replacing the ram or disconnecting other parts...like harddrives, optical drives, modems and what not.
FIRST IF YOU REPLACED THE POWER SUPPLY OF YOUR DELL PC, MAKE SURE IS A RECOMMEND POWER SUPPLY FOR DELL COMPUTERS ONLY BECAUSE DELL USE A DIFFERENT (NONSTARD) PS
AN PLEASE DON'T TURN YOUR PC ON, TILE YOU ARE SURE I'TS A DELL COMPATIBLE POWER SUPPLY YOU CAN FRY YOUR COMPUTER
ON THE MOTHERBOARD I'T MAY BE THE BIOS (BIOS STANDS FOR INPUT /OUTPUT SYSTEM) I'T A CHIP ON YOUR MOTHERBOARD THAT CONTROLS THE SYSTEM HARDWARE AND ACTS AS AN INTERFACE BETWEEN THE OPERATING SYSTEM AND THE HARDWARE I'T MAY BE FLASH IF IS FLASH , YOU PROBABLY NEED TO REPLACE THE MOTHERBOARD OR CALL DELL TO SEE IF THEY CAN FIX IT
You may have a hardware problem of some sort. The first place I'd start is to check the power supply voltages. If one or more voltages is off tolerance, this will cause all sorts of symptoms. if you have a voltmeter check especially the +5, +3.3, +12, & +5 standby voltages. Use this site as a reference http://pinouts.ru/Power/atx_v2_pinout.shtml
If the supply checks out faulty, buy a replacement, or, if tech savvy, you might repair it-- probable component defects= one or more electrolytic capacitors.
Other possible problems are Memory errors (try subbing a RAM stick), hard drive developing errors, or a bad chip on the motherboard. If you have some spare parts, RAM, hard disk, you can try subbing parts and narrow down the problem.
This could be a corrupted bios, look on the motherboard for the 'JBAT1' terminal and put the plastic jumper cap from pins 1-2 to pins 2-3 for a few seconds then back to pins 1-2.
Start the pc hopefully and press F2 or DEL to enter the bios and set the time and date in standard bios settings and look for the auto detect drives and select it.
press ESC and and save settings and it will re boot and go into windows if the softwaere was not corrupted when it was turned off at the button.
The flashing power switch and power supply LED on the rear in conjunction with a power failure or surge indicates that there is a defective component; typically the power supply, motherboard, memory, processor or modem.
-Disconnect all the power supply leads, drives, and motherboard as well as any USB, firewire and other external devices.
-Plug in the 115v power supply cable and look at he LED on the back of the power supply. If it is still flashing the power supply is bad and needs to be replaced.
-If it isn?t flashing then unplug the power supply plug in one device, plug in the power cord and watch for the flashing LED again. If it?s flashing you?ve found your culprit, if not move on to the next component and repeat the process until you?ve found it. Don?t forget your plug in cards could also be the problem.
Good luck and let us know if you have any other questions. As always please don?t forget to rate this posting.