TS1587 macbook won't display desktop

my Mac book will power up but the apple sign remains in the middle of the screen and a gear turning below it -nothing else happens -can you help? I had to do a force quit because I was emptying the trash bin and it got stuck and wouldn't progress.
Thank you

With the DVD that came with your computer, boot from it pressing C key, go to Utilities > Disk Utility, select your hard drive and press Repair Disk. Repeat it with Macintosh HD. If it doesn't work, reinstall

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