when my dell 8400 went dead i decovered 2 pins from the 4 pins on the psu connector is badly burned
looking at the connector on the mb there is slight burn damage would the mb also be fried
now do i get a new psu and discover the mb is also fried and possibly other damage.
would be greatfull for any asst
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Looks like you power supply blew up. If you are familiar with electronics get a cheap PC PSU tester. Remove side panel detach the 20-24pin ATX connector and 4 pin CPU power connector; attach them to the tester and connect PC to the mains to see what (if any) voltages are absent. If yes you have to order a new PSU. If the tester shows your PSU is okay or if these instructions seem "mumbo jumbo" to you then you'd better contact HP support ;)
LOL... If you haven't already fried your motherboard by using your modified PSU (And that's a big IF), then you need to buy a new PSU with similar specs and connection plugs (ie. a 24pin main) as the original PSU that came with the PC.
Should work fine. Only issue you may run into is getting the cable settings (master / slave) set up so everything shows up. Most likely if you're replacing an existing one you can get away with just setting the new drive to cable select or what the previous drive was set to though.
Be sure that the ATX or BTX power cable (the rectangular cable with 20 or 24 pins) is securely fit into the motherboard. Re-seat it if needed. Also, check the +12V 4-pin adapter (if exists) is seated, just like the 20/24 pin is. If that doesn't solve the problem, be sure that the PSU is switched on and is at 120V (USA) before plugging in the power cable. If that doesn't work, contact the computer manufacturer or the PSU manufacturer (depdending on what you purchased.)
Remove the PSU from the case.
Plug it to power.
Turn it on
Using a paper clip, short circuit the green wire pin with the the black wire pin on the 24 pins connector.
If the PSU fan start, remove the clip. The fan should keep spinning. That means that the PSU is working.
If the PSU is working, then the power up pins on the mother board might not be shortcircuited by the front panel switch.
Connect the PSU to the motherboard and to the power, turn it on. On the motherboard, locate the power up pins and short circuit them with the paper clip. If the computer powers up then there is a problem with the power on switch.
If the PSU does not start at all, return it.
If you can't return it, unplug from power, open it (warrenty voids!) and look for a fuse that looks like a one inch glass tube with metal caps. inside should be a wire. If the wire is broken, buy a new fuse in Radio Shack.
Did you just add the second CD? If you did you may need the driver for the mother board? Make sure the power cord for the cd has voltage plug it into the DVD drive also check the cable make sure red stripe is on the correct side of drive. You can download the driver at http://www.emachines.com/support/product_support.html?cat=Desktops&subcat=T-Series&model=T2672
User guide is there as well.
The start button has a pair of wires with a small pin connector on it. This will connect to the motherboard if there is a 3 pin set you might try moving to the other pin. The new power supply also has to provide a start voltage? Your power supply may not be compatible or it may put the voltage on the third pin.