After power surge g5 won't start.

We had a power surge the other night. Now when I try to start my computer I get a message that says to hold down the power button to restart  the computer and the fans start to run loudly. I tried starting in safe mode but that simply keeps the message from popping up. Ideas? Please help!!

It shouldn't affect that, but may not help is all.
Do you have the Install Disc for this Mac & OS?
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214

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    Oct 26 23:54:04: Disk Utility started.
    Verifying volume “Macintosh HD”
    Checking HFS Plus volume.
    Checking Extents Overflow file.
    Checking Catalog file.
    Checking multi-linked files.
    Checking Catalog hierarchy.
    Checking Extended Attributes file.
    Checking volume bitmap.
    Checking volume information.
    The volume Macintosh HD appears to be OK.
    Mounting Disk
    1 HFS volume checked
    Volume passed verification
    Preparing to secure free space : “Untitled”
    Creating Temporary File
    Securely erasing file
    Creating Temporary File
    Securely erasing file
    Secure Erase Free Space stopped after 14 hours.
    89.0% complete.
    Erase complete.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions differ on ./Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents /MacOS/InternetUtilities, should be -rw-rw-r-- , they are -rwxrwxr-x
    Permissions differ on ./Library/Application Support/Macromedia/Shockwave 10/Shockwave 10 Preferences, should be -rwxrwxr-x , they are -rw-rw-r--
    User differs on ./Users/Shared/SC Info, should be 0, owner is 501
    Group differs on ./private/etc/authorization, should be 80, group is 0
    The privileges have been verified or repaired on the selected volume
    Permissions verification complete
    Repairing permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions differ on ./Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents /MacOS/InternetUtilities, should be -rw-rw-r-- , they are -rwxrwxr-x
    Owner and group corrected on ./Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents /MacOS/InternetUtilities
    Permissions corrected on ./Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents /MacOS/InternetUtilities
    Permissions differ on ./Library/Application Support/Macromedia/Shockwave 10/Shockwave 10 Preferences, should be -rwxrwxr-x , they are -rw-rw-r--
    Owner and group corrected on ./Library/Application Support/Macromedia/Shockwave 10/Shockwave 10 Preferences
    Permissions corrected on ./Library/Application Support/Macromedia/Shockwave 10/Shockwave 10 Preferences
    User differs on ./Users/Shared/SC Info, should be 0, owner is 501
    Owner and group corrected on ./Users/Shared/SC Info
    Permissions corrected on ./Users/Shared/SC Info
    Group differs on ./private/etc/authorization, should be 80, group is 0
    Owner and group corrected on ./private/etc/authorization
    Permissions corrected on ./private/etc/authorization
    Permissions repair complete
    The privileges have been verified or repaired on the selected volume
    Name : Macintosh HD
    Type : Volume
    Disk Identifier : disk0s3
    Mount Point : /
    File System : Mac OS Extended (Journaled)
    Connection Bus : ATA
    Partition Type : Apple_HFS
    Device Tree : first-boot/@0:3
    Writable : Yes
    Universal Unique Identifier : 2C999ACE-B114-3460-8FE0-4013F539F100
    Capacity : 232.8 GB (249,925,094,400 Bytes)
    Free Space : 221.5 GB (237,882,122,240 Bytes)
    Used : 11.2 GB (12,042,969,088 Bytes)
    Number of Files : 298,349
    Number of Folders : 76,969
    Owners Enabled : Yes
    Can Turn Owners Off : Yes
    Can Repair Permissions : Yes
    Can Be Verified : Yes
    Can Be Repaired : Yes
    Can Be Formatted : Yes
    Bootable : Yes
    Supports Journaling : Yes
    Journaled : Yes
    S.M.A.R.T. Status : Verified
    Disk Number : 0
    Partition Number : 3
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Verifying volume “Macintosh HD”
    Checking HFS Plus volume.
    Checking Extents Overflow file.
    Checking Catalog file.
    Checking multi-linked files.
    Checking Catalog hierarchy.
    70 %)
    Checking Extended Attributes file.
    Checking volume bitmap.
    Checking volume information.
    The volume Macintosh HD appears to be OK.
    Mounting Disk
    1 HFS volume checked
    Volume passed verification
    Oct 27 20:59:00: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Verifying volume “Macintosh HD”
    Checking HFS Plus volume.
    Checking Extents Overflow file.
    Checking Catalog file.
    Checking multi-linked files.
    Checking Catalog hierarchy.
    Checking Extended Attributes file.
    Checking volume bitmap.
    Checking volume information.
    The volume Macintosh HD appears to be OK.
    Mounting Disk
    1 HFS volume checked
    Volume passed verification
    Name : Macintosh HD
    Type : Volume
    Disk Identifier : disk0s3
    Mount Point : /
    File System : Mac OS Extended (Journaled)
    Connection Bus : ATA
    Partition Type : Apple_HFS
    Device Tree : first-boot/@0:3
    Writable : Yes
    Universal Unique Identifier : 2C999ACE-B114-3460-8FE0-4013F539F100
    Capacity : 232.8 GB (249,925,094,400 Bytes)
    Free Space : 221.6 GB (237,949,358,080 Bytes)
    Used : 11.2 GB (11,975,733,248 Bytes)
    Number of Files : 298,359
    Number of Folders : 76,970
    Owners Enabled : Yes
    Can Turn Owners Off : Yes
    Can Repair Permissions : Yes
    Can Be Verified : Yes
    Can Be Repaired : Yes
    Can Be Formatted : Yes
    Bootable : Yes
    Supports Journaling : Yes
    Journaled : Yes
    S.M.A.R.T. Status : Verified
    Disk Number : 0
    Partition Number : 3
    Oct 28 00:31:37: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Verifying volume “Macintosh HD”
    Checking HFS Plus volume.
    Checking Extents Overflow file.
    Checking Catalog file.
    Checking multi-linked files.
    Checking Catalog hierarchy.
    Checking Extended Attributes file.
    Checking volume bitmap.
    Checking volume information.
    The volume Macintosh HD appears to be OK.
    Mounting Disk
    1 HFS volume checked
    Volume passed verification
    Oct 28 18:50:53: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Oct 28 21:00:10: Disk Utility started.
    Verifying volume “Macintosh HD”
    Checking HFS Plus volume.
    Checking Extents Overflow file.
    Checking Catalog file.
    Checking multi-linked files.
    Checking Catalog hierarchy.
    Checking Extended Attributes file.
    Checking volume bitmap.
    Checking volume information.
    The volume Macintosh HD appears to be OK.
    Mounting Disk
    1 HFS volume checked
    Volume passed verification
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Repairing permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions repair complete
    The privileges have been verified or repaired on the selected volume
    Oct 29 19:55:10: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions differ on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/Info.plist, should be -rw-rw-r-- , they are -rw-r--r--
    Permissions differ on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/MacOS/Flash Player, should be -rwxrwxr-x , they are -rwxr-xr-x
    Permissions differ on ./Library/Internet Plug-Ins/flashplayer.xpt, should be -rw-rw-r-- , they are -rw-r--r--
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Repairing permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions differ on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/Info.plist, should be -rw-rw-r-- , they are -rw-r--r--
    Owner and group corrected on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/Info.plist
    Permissions corrected on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/Info.plist
    Permissions differ on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/MacOS/Flash Player, should be -rwxrwxr-x , they are -rwxr-xr-x
    Owner and group corrected on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/MacOS/Flash Player
    Permissions corrected on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/MacOS/Flash Player
    Permissions differ on ./Library/Internet Plug-Ins/flashplayer.xpt, should be -rw-rw-r-- , they are -rw-r--r--
    Owner and group corrected on ./Library/Internet Plug-Ins/flashplayer.xpt
    Permissions corrected on ./Library/Internet Plug-Ins/flashplayer.xpt
    Permissions repair complete
    The privileges have been verified or repaired on the selected volume
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Verifying volume “Macintosh HD”
    Checking HFS Plus volume.
    Checking Extents Overflow file.
    Checking Catalog file.
    Checking multi-linked files.
    Checking Catalog hierarchy.
    Checking Extended Attributes file.
    Checking volume bitmap.
    Checking volume information.
    The volume Macintosh HD appears to be OK.
    Mounting Disk
    1 HFS volume checked
    Volume passed verification
    Name : Macintosh HD
    Type : Volume
    Disk Identifier : disk0s3
    Mount Point : /
    File System : Mac OS Extended (Journaled)
    Connection Bus : ATA
    Partition Type : Apple_HFS
    Device Tree : first-boot/@0:3
    Writable : Yes
    Universal Unique Identifier : 2C999ACE-B114-3460-8FE0-4013F539F100
    Capacity : 232.8 GB (249,925,094,400 Bytes)
    Free Space : 221.6 GB (237,921,976,320 Bytes)
    Used : 11.2 GB (12,003,115,008 Bytes)
    Number of Files : 299,521
    Number of Folders : 77,045
    Owners Enabled : Yes
    Can Turn Owners Off : Yes
    Can Repair Permissions : Yes
    Can Be Verified : Yes
    Can Be Repaired : Yes
    Can Be Formatted : Yes
    Bootable : Yes
    Supports Journaling : Yes
    Journaled : Yes
    S.M.A.R.T. Status : Verified
    Disk Number : 0
    Partition Number : 3
    Oct 29 20:22:20: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Oct 30 17:14:49: Disk Utility started.
    Name : Macintosh HD
    Type : Volume
    Disk Identifier : disk0s3
    Mount Point : /
    File System : Mac OS Extended (Journaled)
    Connection Bus : ATA
    Partition Type : Apple_HFS
    Device Tree : first-boot/@0:3
    Writable : Yes
    Universal Unique Identifier : 2C999ACE-B114-3460-8FE0-4013F539F100
    Capacity : 232.8 GB (249,925,094,400 Bytes)
    Free Space : 221.1 GB (237,409,587,200 Bytes)
    Used : 11.7 GB (12,515,504,128 Bytes)
    Number of Files : 299,790
    Number of Folders : 77,188
    Owners Enabled : Yes
    Can Turn Owners Off : Yes
    Can Repair Permissions : Yes
    Can Be Verified : Yes
    Can Be Repaired : Yes
    Can Be Formatted : Yes
    Bootable : Yes
    Supports Journaling : Yes
    Journaled : Yes
    S.M.A.R.T. Status : Verified
    Disk Number : 0
    Partition Number : 3
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Oct 30 19:41:53: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Oct 31 20:48:58: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Verifying volume “Macintosh HD”
    Checking HFS Plus volume.
    Checking Extents Overflow file.
    Checking Catalog file.
    Checking multi-linked files.
    Checking Catalog hierarchy.
    Checking Extended Attributes file.
    Checking volume bitmap.
    Checking volume information.
    The volume Macintosh HD appears to be OK.
    Mounting Disk
    1 HFS volume checked
    Volume passed verification
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Name : Macintosh HD
    Type : Volume
    Disk Identifier : disk0s3
    Mount Point : /
    File System : Mac OS Extended (Journaled)
    Connection Bus : ATA
    Partition Type : Apple_HFS
    Device Tree : first-boot/@0:3
    Writable : Yes
    Universal Unique Identifier : 2C999ACE-B114-3460-8FE0-4013F539F100
    Capacity : 232.8 GB (249,925,094,400 Bytes)
    Free Space : 221.1 GB (237,362,040,832 Bytes)
    Used : 11.7 GB (12,563,050,496 Bytes)
    Number of Files : 300,773
    Number of Folders : 77,858
    Owners Enabled : Yes
    Can Turn Owners Off : Yes
    Can Repair Permissions : Yes
    Can Be Verified : Yes
    Can Be Repaired : Yes
    Can Be Formatted : Yes
    Bootable : Yes
    Supports Journaling : Yes
    Journaled : Yes
    S.M.A.R.T. Status : Verified
    Disk Number : 0
    Partition Number : 3
    Nov 3 15:48:08: Disk Utility started.
    Verify permissions for “Macintosh HD”
    Determining correct file permissions.
    Permissions verification complete
    The privileges have been verified or repaired on the selected volume
    Name : Macintosh HD
    Type : Volume
    Disk Identifier : disk0s3
    Mount Point : /
    File System : Mac OS Extended (Journaled)
    Connection Bus : ATA
    Partition Type : Apple_HFS
    Device Tree : first-boot/@0:3
    Writable : Yes
    Universal Unique Identifier : 2C999ACE-B114-3460-8FE0-4013F539F100
    Capacity : 232.8 GB (249,925,094,400 Bytes)
    Free Space : 221.1 GB (237,411,020,800 Bytes)
    Used : 11.7 GB (12,514,070,528 Bytes)
    Number of Files : 300,976
    Number of Folders : 77,880
    Owners Enabled : Yes
    Can Turn Owners Off : Yes
    Can Repair Permissions : Yes
    Can Be Verified : Yes
    Can Be Repaired : Yes
    Can Be Formatted : Yes
    Bootable : Yes
    Supports Journaling : Yes
    Journaled : Yes
    S.M.A.R.T. Status : Verified
    Disk Number : 0
    Partition Number : 3
    Nov 3 16:12:13: Disk Utility started.

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