windows 7 won't start

i recently damaged the screen on my inspiron n5030 - the corner of it got crushed a little by the lid closing on something placed just at the side of the keyboard - i mention that just to say that there was no violent impact or anything.
I bought a new screen and fitted it - simple enough - and when i powered up everything seemed ok.. except.. i got this odd message that windows didn't recognise the battery (original Dell battery only a few months old) & that it wouldn't be charged. Apart from that, everything was fine. I looked up a solution to the battery thing online and tried one which involved powering on/off with/without battery. But after i completed that, windows will no longer start. The screen functions ok, comes up with the 'starting windows' graphic, but then goes grey, with the cursor arrow mid-screen. You can move the cursor with the touch pad, but that's it - nothing else at all. I have tried running windows repair - and i've tried running a system restore, to a win7 version a week or so ago.. still no joy - i get exactly the same problem.. windows won't start.

Any ideas?

i'll add a little to that. When i run startup repair it says it can't repair the problem automatically.
under problem details the significant ones (i think) are these:
problem signature04: 21200642
problem signature05: autofailover
problem signature07: CorruptVolume

does that help?