MacBook Pro won't start. Apple Logo then Circle with bar across

Problems started yesterday. I noticed that my MacBook Pro was running really slow. Every time I clicked on something, it took for ever. Today, it seemed fine until about an hour ago when it started running slow again.
I decided to check Disk First Aid, but the computer froze before I was even able to access the contents of the Utilities folder.
I tried to restart, but the computer just seemed to freeze.
I reset the PRAM, then restarted: it got to the Apple Logo, then a circle with a bar across it. Doesn't bode well and I'm thinking this means it can't access the disk?
I have ProSoft Data Rescue, and decided to boot from the CD, but couldn't even get the CD in there. Can't remember if there is a CD in the MacBook Pro?
I did a quick search through the help forum, and did a restart by holding down the V key. Here is what I get:
loading kernel cache file ..... Read error )x7
Loading 'mach kernel'
Could not open file "mach kernel"
Error loading kernel 'mach_kernel" (0x9)
whew. does not feel good right now. like I said, I've using my MacBook, have an ethernet cable, and ProSoft DataRescue, but I'm not sure which direction to go.
Help!!!
Message was edited by: lokilo2

Update:
This morning, the computer started up. Amazing. Amazingly slow, but it started.
I decided it was best to try and save docs, so I put in a dvd, moved some files in there, tried to burn - mind you, this took about 1/2 an hours because it was SO slow - went out and watered the garden, came back and... the burn was unsuccessful. Apparently there were some errors with docs.
At this point, I decided to try and use the Data Rescue disc, but now the burn disc wouldn't come out. It was a "burn folder" and the disc was nowhere to be seen. Maybe I messed up something while trying to burn, I don't know. Anyway, I tried to restart, hoping this would get the dvd out, but the shutdown took forever that I finally just forced quit.
Please help!

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WhatSize >>
-Bmer
Mac Owners Support Group
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Message was edited by: Klapschaats

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<Edited by Moderator>

TS2570 My MacBook Pro won't start up.only gray screen

Hi there,
My MacBook Pro won't start it show only gray screen (with apple logo )
And I have tried these solutions none of them worked
1/ Reset PRAM and NVRAM
2/ Restart in safe mode
3/Run Disk Utility in Single User Mode
After I tried third option it shutdown by itself
Please I need data inside the laptop , i have no backup
what should I do ?
I need some kind of solution does not contain formatting or deleting my data
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My computer is not working, is my personal data lost?

MacBook Pro won't start. Apple Logo then Circle with bar across

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