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Is the computer new, or has it been working until recently?
Has any work, or modification, been done on the computer lately?
OK. So what is the last thing you see on the screen, before the system restarts?
And, do you have an alternate bootup source for the system, such as a bootup CD or Windows install disc?
I think trying to boot up an alternate way would be
A. a good trouble-finding technique, and
B. it may be necessary in any case as things turn out. (Does your custom-built system have a CD or DVD drive as a part of it? I hope so.)
So the Windows logo appears?
OK... if what is on the hard drive is, a recycled hard drive/recycled installation of Windows, then that may be the problem.
Windows installs itself according to the CPU chip type used, the CPU code in detail, etc.
If you take a hard drive from one type of CPU chip-based computer, and put that hard drive with its working (with CPU-chip-"1") Windows installation, into a computer with CPU-chip-"2", the code won't work and the Windows won't boot up, may crash, or restart endlessly as yours does.
So if the hard disk is recycled from another computer, whose CPU chip was different from the current mother board's CPU chip, then that's your problem. You will need to reinstall Windows on the current CPU... or otherwise alter the Windows installation for complete workable compatibility.
(If you doubt any of the above, please give me details at least on
1. where the Windows 7 installed hard drive came from, and
2. what CPU chip was on the computer it last booted up OK with, and
3. what CPU chip is the basis of the current custom-built computer, please.)
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Is the emachine, the custom-built system that you are asking about?
Or, is the emachine the HD boots up on, one with a CPU chip similar to the model of Dell the hard disk originally came out of?
The basic point I'm making is:
- Windows installations, e.g. a Windows 7 install in this case, are not all alike, and are *not* all interchangeable.
- some Windows installations on a hard disk, can be swapped from machine to machine, just fine. I swapped a Windows XP installed on a Toshiba laptop, into a Dell laptop, and it worked there (with a few drivers installed / added to the Windows XP, for the Dell laptop's particular cards and sub-hardware-assemblages). But I was careful to see to it that the CPU chip in the Dell matched the CPU chip in the Toshiba... that's why it worked right-off (except for some driver details.)