Unfortunately the Mavericks Installer progressbars are not very user friendly. You just have to be patient with it. If you interrupted it before it clearly said it was done with the installation, you may have to reinstall. You may need to bring it in to service if you didn't make a backup or have a backup of the Mavericks installer program.
http://support.apple.com/kb/TS2570 Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/HT3964 Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT1379 Resetting your Mac's PRAM and NVRAM
You may also wish to post in the Maverick forum. Perhaps the users there will have a few tips/tricks.