new psu, new problems, emachine

I replaced the psu on my emachines T2642 with the recommended 300 unit. Everything fit exactly. powered up just great. Now however I have no speakers, the usb ports do not work and videos do not run properly. Is this the motherboard or what? please help

 

Did the original PSU fail? If so, in about 90% of the cases a PSU failure in an eMachine will also take out the motherboard or other components. The failure MAY have just damaged the board rather than causing a complete board failure.

 

yes the psu failed

 

Check and make sure all your connections are correct and tight. Remove and re-seat the memory modules and any add in cards. If you have a motherboard manual for the machine I would recommend clearing CMOS.

If you perform the above mentioned items and the machine still has problems there is a high percentage of probability that a motherboard component or components were damaged when the PSU failed.

The only way to prove this is by replacing board components such as memory, add in cards, etc. with known good components.

 

I checked the connections already. Will check the cards as well. Thanks!