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AOpen XCcube shuts down after 10 seconds

A friend purchased this compact desktop system as a barebones kit and when she couldn't get it going, it ended up with me.

After adding memory (2-512MB PC2100), processor (Pentium M 725) , optical drive, and HDD, the system went through POST OK, & started to load the OS from the boot CD.  It then shutdown.  Powering on again gets the same result.  No error codes or beeps.  AOpen suggested a new motherboard.

I reassembled the system with the new motherboard (UX855GME) and get the exact same result.

The hardware is stone cold & the fan is working, so I'm not leaning toward an overheating issue.  AOpen's technical support has been reduced to emailing a tech that only suggested that "I borrow a friend's XCcube and try exchanging processor, memory, & power supply."  Since no one within 12 states of me has one of these goofy machines, this ain't gonna happen.

I have built several dozen full-sized systems over the years, but I'm stumped by this one.
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mbutts
Asked:
mbutts
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1 Solution
 
nobusCommented:
i suggest testing with the minimum setup - disconnect also all peripherals and network cables :
motherboard + cpu + 1 ram stick, video card, power supply
on boot, do you have a display?
if NO it is one of the connected, swap ram, Power supply, video card - leaving only motherboard and cpu
if Yes, add devices till the problem shows
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mbuttsAuthor Commented:
I disconnected the optical and HD drives.  The video is integrated.  Boot is OK with one or both sticks of RAM, still shuts down after 10 seconds.  No RAM just gives a long beep error tone.
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nobusCommented:
then 1 of the parts  connected at that time is bad, as  in my first post
you did apply heat paste and the HS is correctly mounted (= flat on the cpu)? because everything looks like a heat issue; and yes, a cpu can overheat in 10 secs.
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mbuttsAuthor Commented:
OK, I must be blind.  There was a thin piece of plastic protecting the bottom of the heatsink that was working as a very effective insulator.  Removed that, applied thermal grease, & reinstalled the fan.  Everything's hunky-dory now.
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nobusCommented:
Great ! happy it's ok now..
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