No boot after QuickPlay

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After using the QuickPlay button on my HP notebook I can no longer boot into "normal" Windows XP. The QuickPlay still works, but when I try to boot normally I can only observe the blinking cursor in the left top corner of the screen and no other activity.

How can I gain access to the boot manager, and select the proper booting partition manually?

Thanks

[TObject]

Update:

I checked the hard-drive; it passed all three: the quick, the comprehensive, and the S.M.A.R.T. checks.

Also I checked that the MBR was not a problem.

Unfortunately I didnâ t have time to figure out what the problem was. I restored the laptop from backup. I will take care to avoid pressing the QuickPlay button in the future.