Trying to Install New Motherboard in Acer computer

you may got a power spike if so board bad look at the board the caps are they round or flat if rounded on top bad board

Could be bad thermocouple, or oxygen sensor, not enough fresh air to unit.
Probably bad PC board. Rheem will send new board and you can install yourself.

Bad PC board is kind of like the motherboard on your computer, so expect same level of performance after replacing motherboard ... which usually means the computer's days are numbered before another major problem.

Copy following links:
http://waterheatertimer.org/pdf/Fault-codes-11003.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Error-code-13.pdf

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is there a question in that statement?

Yes the motherboard is faulty. But it hasn't died on its own, it was damaged by something else in there - most likely the power source is defective and it has effectively fried the boards. The technician should have tested it before replacing the board. Call it again, make him test the source in front of you and if it's defective have it foot the bill for the repair.
If the source is OK then something else that is connected to the pc is defective so multiple test will have to be done.

The 2 most common problems for a no start up situation are bad motherboard or bad RAM. I would suggest trying the easiest things first, and that would be to remove 1 of RAM at a time, and if that doesn't fix it, put the stick that you removed back in and remove the other. This will tell you if it's a RAM related issue. Another thing that you can try is to just "reseat" the processor, making sure that it's seated in it's socket correctly. Hope that helps

First thing you should try is another monitor. It's likely nothing is going to happen but if you get a picture, then that rules out the video card, which means you have a bad cable or a bad monitor. If you're plugging into an external video card, try plugging into the on-board video card. If you get an image then your external video card is shot. If you don't get an image, that rules out anything to do with your video card(s).
If this is the case then it's likely you need new Ram. You can see if this is the problem by removing the Ram and trying it in another computer. If the other computer stops working then the problem is due to faulty ram. If it still works, your ram is fine.

The next step is to test the hard drive. Again, take the hard drive to another computer and plug it in. If your hard drive is recognized, then something is wrong with your processor, the BIOS, or the motherboard.

It's a process of elimination to find out what piece of hardware has stopped working on you.

i will suggest you to send the computer to acer service center and they will replace the new mother board. it will take some time but apart from that they will also check other things as well. you are investing money to replace yourself which can cause more problem. mother board should be the right one so that it should match with the other components of your comp. it wil cost you bit more but the factory fittings will be better than what you will do yourself and risk involved is less. you can also claim them if anything goes wrong. it doesnot matter if it is out of warranty or in waranty. dude you are paying the money and thats more important.

hi there, it may not be the mother board, it may be that the graphics card doesn't have the drivers for your system. Bring it to a computer shop and they will install the drivers for you.

Go into your device manager to see if there is an error.  If there is don't install the software, instead install the driver first.  I would also try to unplug the scanner from the computer and plug it into a different port and wait for Microsoft hardware wizard to pop up and point it to the cd for the driver.

No Mother board is compatable.
The Motherboard and hard drive are paired and cannothe be replaced.
The best thing to do is to buy a new computer and use the Harddrive as a slave on the new one.