Put in a new MB after the first one,,pc..got a power spike and damaged MB and power supply. started up then had lines on the montor so I reset and had long peps after,,I didnt go in to set up first guess i should have. Since was the same MB though it would boot up,,Email is firstname.lastname@example.org MSI MS 6734 VER :1
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It is more than likely the power supply that is faulty. Newer PSU's have a 5volt supply missing, this means that some older boards will not run with the new PSU's. Try and find an exact match for your older supply but with a better power rating, if that is what is required.
Most likely the system board has failed. If the power supply had blown it is not unusual for the subsequent spike to blow the system board. On the other hand it may have been the system board that failed and the PSU is ok. Emachine system boards are rubbish
Either way you will need a new board and most likely a reinstall of the OS
your power supply is possibly dead unplug it and smell the vents if you get a strange smell it has poped a capacitor or 2 try another psu from another pc loose before you buy a new one many a time a voltage spike may have done more damage depending where it got to
I am going to go out on a limb here and infer that when you try to power up the machine you get nothing - no lights, no display no beep. If this is the case then this would be symptomatic of a failed power supply, however the problem may not start or end there it is also sympomatic of a failed MB.
A good power supply will sacrafice itself to protect reliant components if there is a power spike, a "budget" one will pass the damage on.
In answere to your first question about the CMOS battery you are correct.
Basicaly buy a new power supply and don't buy budget but having done that don't be suprized if the MB has gone as well. Worse news is if you do have to change the MB depending on the age of your system you may have replace the CPU as well.
Sorry about the bad news, all I can offer on the positive side is that electrical equipment is usualy covered under a home and contents insurance package or a lease/rental agreement.
more than sure if you have replaced the power supply already and the computer still not working,there must be a electrical damage to the board. it is sure that.but you have to check some other components too seeing that they are stuck in the board,like the procesor and ramm dims or the video card..the electrical charge may have affect them too. but 1st thing to do is to change the mainboard.. oh by the way...just to be sure..try to make a bios reset..maybe it will work and pull out the ramms from the computer..put them back after...ussualy this works... good luck and let me know about bye
Usually this will damage the power supply only.
To make sure your that your motherboard is working, try to find a working power supply unit and connect it.
If it does not work your motherboard may be get damaged. Also check for warranty.
If your system contains a graphics card, check that too, it may also get damaged with voltage variations.