My PC starts up then about 45 seconds it shuts down???

Need more info, Give as much detail as you can. What happens when you push the on/off button? Fan spin? LED's Blink? Any thing on the screen? Sound? Does the computer try to start and a second later shut down? Check the power cord, check the AC outlet? Is it on a UPS? Try AC outlet? Can you get to BIOS or Boot Menu? ETC.

Close windows down. Wait 15 - 20 mins, then power monitor up but NOT windows. Screeen should say "NO SIGNAL in centre. If t does not, wait five mins If still no display shut down and wait another 5 mins. Then start monitor un ANDt windows.. All should be OK now, If not shut EVERYTHING down and disconnect from mains ovrernight. (PC riouter/modem,,,, EVERYTHING . 12 hours later, re-connetc in THIS order - 1.) MONITOR 2.) PC 3) ROUTER/MODEM Should be OK now.

Try this
unplug plug the power cord and remove the battery and hold the power button for 45 seconds,Then reinstall the battery and and try to start the computer,

if it fails to start
unplug plug the power cord and remove the battery and hold the power button for 45 seconds and
remove the memory and any usb devices that may be plugged in,then start it,

If it starts

Allow it to load completely and then shut it down and install one memory stick and restart, if all is well after if loads completely, shut down again and install the other memory stick and restart, if all is well again wait until it loads completely and then plug in and allow to load each of the usb devices you may have

It seems that your unit has some sort of Video side, PSU fault, or a problem to the Video section that is shutting down the Power Supply Unit, PSU. This happens so that no further damage, and possible fire will occur.
You need to take the unit to a reputable service centre/man and ask for a firm "Quote" for the work to be done.

In order to accurately determine and diagnose the problem, a more detailed description of the problem needs to be communicated as opposed to normal operation of the system so a repair person can determine that there is in fact a problem. There's a big difference between solving a problem via text as opposed to seeing what is wrong in the field. They rarely are the same.

Goodman condenser sequence of operation on a matched system. Call for cool, condenser starts, 15-30 seconds later blower motor starts, cool satisfied, condenser shuts down, 15-45 seconds later blower motor shuts down. House heats ups and a call for cool via the thermostat starts another cycle.

Based on normal operation it is impossible to determine whats wrong with the information given. There are perhaps 5 voltage measurements in the system that you could be referring to.

1. Normal shutdown: select Start - Shut Down - Shut Down

2. System hangs: select Alt-Ctrl-Del and then Shutdown

3. If #2 doesn't work - hold the power button until the screen is dark

Hope this helps.

Your HD's probably bought it, but you can always try to read from it later after you reinstall to a new hard drive or drive array (striped SATA is fast!)

Replace the following capacitors:

3 pcs. - 220 microFarad - 25v
2 pcs. - 1000 microFarad - 25v
1 pc. - 2200 microFarad - 25v

Resolder the 2 inverter transformer's legs.

Roan
Triangle Tech Whiz

pop the CPU, take a closer look athe chip and the socket, make sure there is nothing can create a short of creating any kind of heat. if you don't find anything there, I suggest a new CPU in order.

Ok.....

1. Make sure ALL user accounts are logged off!!!
2. UPDATE ALL DRIVERS
3. Check to see how many Programs are running while attempting to Shutdown the PC..(the more programs it tries to close, the longer it can take...(ESPECIALLY WITH LOW AMOUNT OF RAM/SLOWER RAM)