In general the "no OS installed" error happens during the period when the boot process tries to read the MBR
Here's a "down and dirty" about the Vista boot sequence (from wikipedia)
MBR (Master Boot Record) (where the missing OS message comes from)
Windows Boot Manager
Read from BCD (Boot Configuration Data)
Search for hibernation file
Start ntoskrnl.exe (I think that the splash screen appears here)
start services and login interface
During the period between the MBR and ntoskrnl.exe, one of the things that happens is that some drivers are loaded (the video drivers in particular). But several things could happen at this point...
The video drivers could be corrupt and fail to load (but this also happens in Safe Mode - so it's not likely to be that).
The hard drive could be corrupt, causing issues with the video drivers (but the Seagate test and chkdsk say that's not likely)
Or the video card could be having problems (but it works before Windows get around to messing things up).
So, in short, nothing's wrong and your system is working just fine!
Try this link to check your boot performance: http://content.zdnet.com/2346-12354_22-64715-2.html
and look for the errors to see what they point at. Let us know what errors you find and we'll work from there.
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