I have an E-Machine T1860 which I'm not able to boot up. Already checked all the usual, wall pwr, pwr cord, etc. Opened her up and saw the caps bulging on the motherboard. I've never had the issue where the power wouldn't cycle because of this but figured, what the hell. So, I replaced the caps (8 total) around where the pwr supply connents to the mother board. Still a no go. Ohmed out the power switch; it's good. When I did plug the pwr connector back to the mother board, the mother board fan and the power supply fan will come on if I jiggle it just right (hehe). However, if it's fully connected I got nothing. So, while I had the fans running, tried to turn it on, no go. I voltage tested the connection to the hard drive. I'm getting what seems to be an inconsistent overload of voltage to the hard drive (at least to high for my multi-meter to read; got a fluke 77III so it should read high). It's very jump.
Anyway, opened the pwr supply and there doesn't appear to be anything visually wrong. I'm not sure what all the pins from the pwr supply do so I'm having trouble testing the voltages out to determine if the pwr supply or the mother board are bad.
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Normally if the computer has the black display then follow these steps:
1) disconnect the pwr cord form the back of the computer //
2) disconnect the printer and the internet cord//
3)hold the pwr button for 1 min and then release// this is called "pwr drain" when the pwr cord is disconnected//
4)connect the pwr cord and restart the computer and see if it boots or not.
5)if not then disconnect the pwr cord again and open the side pannel of the computer//
6)on the mother board you will find the RAM (MEMORY CARD) which will be approx 6 inch long", take out the card/s and plug the pwr cord and restart the computer//
7) if you get the beep sound then the mother board is ok and if you do not get the beep sound then the problem could be mother board//
8)if getting the beep sound then fix the RAM CARD properly and restsrt the computer// it shoul boot//
note** during all this process make sure that the pwr cord is pulled out when you put your hand inside the computer or else you can get power shock..
Possibly a broken wire. It is common for the flexible cable to break at the 3 pin plug end from constantly pulling the cord / plug out of the socket or if its a retractible cord, they get broken where the cord enters the machine rewinder. this happens when the cord is pulled out to its maximum length all the time and eventually cuts through the cord. I would try a new 3 pin plug first.
Check the USB ports for damaged contacts. If the supply powers up and then shuts down immediately, you have a critical error.
Damaged USB port contacts can cause this but so can graphics cards etc. Open the machine up and remove all cards and memory sticks and unplug all the drives but LEAVE THE CPU ALONE!!
Now, turn it on. If it boots and starts beeping ( which it will with no memory installed) shut it down and reinstall each item you removed one at a time and turn it on after each single thing. When it stops booting and does whats its doing now then the last thing you plugged back in is the issue.
If it still doesn't power up with everything removed then the issue is in the mainboard.
If this is th case, my advice is to seek professional advice..
If there are two wires running from the power button on your case to the motherboard, take them off and try jumpering those two terminals with a jumper or something that will make contact for just a second and them take back off. Your power button may have fried along with the power supply.
Hi check the cables from the case to the mother board. They should be marked and the manual that came with the board ,this show you where to connect them on board The std markings are HDD [red led] PWR S [powerswitch] RSW [reset switch] PWR LED [case power light] in most cases check to see if this is correctly connected To test if there is no fault in the board or power pack. first visualy check the board to see if it shows a red led light when the power is turned on, if not the problem is in the power pack or the wall outlet. second if the light is on, bridge the pins marked pwr switch on the board with a screw driver and this should start the computer, check the processor and ram if not you have a faulty board.