Why does Emachines ET1331G-07w get to logo screen and stop?

I have an Emachines ET1331G-07w here that gives one beep upon start-up, gets to the eMachines logo screen, and then hangs.  Switched out the RAM, tested the power supply with my testor and it tested ok.   I switched power supplies anyway, to no avail.   I took the hard drive out and put it in an external SATA dock; had no trouble reading files.  Only thing else I can think of is the motherboard, but don't know why it would post and get to logo screen if mobo was bad.   Anyone have any ideas?    They would be greatly appreciated.
t6billAsked:
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DavidPresidentCommented:
If you can read the HDD in an external dock, then it is OK (well, there is always possibility of a few bad blocks, but this is certainly not behaving like a catastrophic drive failure).

I'd go to the E-machines site, and look into warranty replacement. but warning, not turning in the HDD could violate their warranty.
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DavidPresidentCommented:
it could be a munged up copy of whatever O/S you are running/

 Why not go to ubuntu.com on another PC, download a live CD, or make a bootable USB stick.  then boot another O/S.  If it is the motherboard is problem, then it will do same with the other O/S.  If the other O/S boots fine, then you can go down path of recovering a hosed O/S, knowing the hardware is most likely fine.
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t6billAuthor Commented:
Tried to get [Admin Edit] boot CD, no luck.   Cannot get into BIOS or boot order, although they are listed with their hot keys on this logo screen.  Also, ps2 or usb keyboard will not work (does not display a Numlock light) either.  
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DavidPresidentCommented:
That boot CD can't be mentioned here,  It contains pirated stuff so is a violation, BTW.  But since it has a boot loader, then you are down to memory, cpu, motherboard, power, typically.
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t6billAuthor Commented:
No keyboard lights at all.   Either usb or ps2.    Could it possibly be the MBR on the hard drive?   I can read the files fine when I put it in an external dock.  
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t6billAuthor Commented:
I think it is the motherboard, believe I have eliminated everything else.  
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DavidPresidentCommented:
agreed, motherboard
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