BSOD on initializing chkdsk, no cursor, few rows of colored garbled pi

[faraway1nspace]

Hello all,

I tried to do a routine (once a year) chkdsk via the command prompt

> chkdsk /r
> shutdown /r /f /t 1

. And upon the reboot, all I get is a black screen, no cursor, with ~4 rows of rainbow, garbled pixels at the very top of the monitor (certain pixels occasionally change colours). This occurs before the windows splash screen. I have left the computer as is, hoping it will eventually boot on its own with no luck.

Can you help me please? I haven't had any problems, and this was just a routine check. Some more information, I dual-boot with Ubuntu. I can mount and access the windows partition from Ubuntu, and I even ran ntfsfix in Ubuntu (which has some analogous functionality to chkdsk), but it didn't notice any problems, nor did it solve the issue.

Thank you for your help,
faraway1nspace

 

[faraway1nspace]

Hello again, eventually this issue 'resolved' itself: I waited 3 hours and the computer rebooted, and windows 7 has loaded successfully. Is this solved? I suspect that chkdsk was running after all, but it was the GUI display that was garbled, giving all external appearances of being a BSOD, aside from the mysterious rainbow pixels at the top of the screen.

I will flag this as solved, however, I would still like to know why this happens? Is there something wrong with chkdsk? a graphic driver?

Thanks,
faraway1nspace