Windows won't boot unless a bootable CD is present

I've installed windows previously many times without any issues and consider myself to be very experienced.
I have performed a clean installation of Windows 7 Pro on an Acer Travelmate laptop. When I remove the DVD and attempt to boot the laptop recognises no bootable media.
If I run the windows installation DVD and attempt a repair, the automatic repair informs me that there is nothing wrong with the installation. Now here's the funny bit ...
If I leave the DVD in the drive the laptop asks whether I want to boot the DVD, which I ignore. The Hard drive with the installed OS boots successfully and works 100%. I have completed the installation, patched the drivers, and performed most
of the windows updates without any problems. If I remove the DVD the Hard Drive doesn't boot - If the DVD is in place the Hard Drive does boot.
HELP PLEASE

I FOUND IT !!!
The laptop was formerly installed with Windows 8 and he installed with Windows 7.
After a flight the laptop failed to boot.
In the BIOS I noticed that the drive occasionally reported as Frozen.
I followed the instructions on the Acer site and this made no difference.
Convinced that the problem related to the change from UEFI to Legacy BIOS and disk/BIOS security I decided to manually reset everything step by step. After this, the laptop booted OK and the problem was resolved. I am sure that the following
is more comprehensive than necessary, but this is the procedure I followed:
F2 - Enter BIOS
Set mode to UEFI
Save and Exit / Power Off (remove battery and supply)
Restart and F2 immediately to enter BIOS
Disable secure boot
Save and Exit / Power Off (remove battery and supply)
Restart and F2 immediately to enter BIOS
Change to Legacy Mode
Save and Exit / Power Off (remove battery and supply)
Restart and F2 immediately to enter BIOS
Set Supervisor password
Save and Exit / Power Off (remove battery and supply)
Restart and F2 immediately to enter BIOS
Enter Supervisor Password when prompted
Set Drive Password
Save and Exit / Power Off (remove battery and supply)
Restart and F2 immediately to enter BIOS
Enter Drive password when prompted
Enter Supervisor Password when prompted
Clear Drive Password
Save and Exit / Power Off (remove battery and supply)
Restart and F2 immediately to enter BIOS
Enter Supervisor Password when prompted
Clear Supervisor Password
Save and Exit / Power Off (remove battery and supply)
Restart and the drive was detected and booted 100%
I hope this helps someone else
Jonathan

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Relative noobie here so here goes,
I just bought two sticks of corsair 500mhz pc4000 ram (256mb each) for my pc. I managed to get the ram to boot at 400 mhz but windows will not boot unless I set the system bus speed to 166. At 200 the bios will boot and it does detect the processor as a 3200+ with ram running at 400 mhz but right before the windows boot screen (the black one with the low res windows logo) I get a beep and the system restarts. Here is the info on my specs
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antec true 380w power supply http://www.antec.com/specs/true380_spe.html
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cannot see any thing obvious
that boards never going to run dual channel
its some cut down single channel chipset
from another forum i belong to
http://www.nforcershq.com/forum/viewtopic.php?t=40296
K7N2-V AND K7N2-VL MS-6729
BE WARNED THESE ARE SINGLE NOT DUAL CHANNEL BOARDS
http://www.msicomputer.com/product/detail_spec/product_detail.asp?model=K7N2-V
AND DONT EVAN APPEAR ON MAIN MSI SITE
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http://www.rojakpot.com/default.aspx?location=3&var1=30&var2=0
http://www.msi.com.tw/program/support/download/dld/spt_dld_list.php?kind=1&ID=17&CHIP=17&NAME=Archives
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that link gets a single bios
http://www.msi.com.tw/program/support/download/dld/spt_dld_detail.php?UID=472&kind=1
5.2 Update date 2003-7-17
Update Description -Change DMI type2's product name to "MS-6729"
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Special note ,
Download 6729v52.exe
http://download.msi.com.tw/support/bos_exe/6729v52.exe
update new bios for it
Model Version Size Platform BIOS BIOS Date Counter
K7N2-V v. 5.3 257 kb AMD Award BIOS 3/12/2004
1. This is Award BIOS release
2. This BIOS fixes the following problems of the previous version:
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What could the problem possibly be? I will try anything!
1. Is there some kind of safe mode for the hard drive settings?
2. Is there some kind of safe mode for memory speed?
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Originally posted by Falconis Progmadn
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T430u, x301, x200T, x61T, x61, x32, x41T, x40, U160, ThinkPad Tablet 1838-22R, Z500 touch, Yoga Tab 2 Windows 8.1, Yoga Tablet 3 Pro
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G4 PowerBook won't boot unless I press Option key - powers off after 20secs

(Originally posted as topic "will only boot when in Verbose mode")
When booting up, my PowerBook only gets as far as the initial black screen and audio chime. After approx. 20 seconds the hard disk/super-drive dies with a high-pitched squeak, just before it was supposed to show the grey screen and then the Apple logo.
If I hold down the Option key, it boots up fine! However, Option-V fails to display the Verbose mode messages (has only done so once after I flashed the PROM, has not done it since.)
I've re-installed Tiger 10.8.4, flashed the PROM, removed the battery and reset the Power Management Unit with 5-second power-switch, but still no change.
Could it be caused by a problem with a faulty video DVI adaptor or socket? (plugs in directly under the power switch - I got an unwanted power-down message as I unplugged the adaptor tonight). The last time the machine worked ok was when I had it plugged in to a multimedia projector throught the DVI adapter.

I'm pretty sure it's not an issue with the OS.
* A clone of the OS on another disk boots fine - this would not boot if the issue was a system one.
* A vanilla Snow Leopard install on the same (not working disk, but 2nd partition) won't boot either. If the issue was with the system this one would boot.
* Erasing this second partition didn't help.
(I've already done all the above suggestions using Single user mode etc.)
Now a similar issue reported here:
http://forums.macrumors.com/showthread.php?t=501768
suggests using fdisk to make the boot disk 'active'.
+A common mantra provided here to newbies for setting up for installation is:+
+Make the partition Primary+
+Make the partition ID=AF (signifies an HFS partition)+
+Make the partition Active+
+There is a built-in Unix utility in MacOSX that can be used to set your partition "Active". It is called Fdisk+
However, when I use Fdisk my disk reports a negative size:
fdisk: 1> p
Disk: /dev/rdisk3 geometry: -5415437/4/63 [-1364690128 sectors]
However, it also does this with another 1.5TB disk I have suggesting that the size of the disk is a problem. Is there another way to make the disk 'active' as this seems to be where the problem lies.

IMac will turn on, but won't boot unless I wait until the next day

I've searched this forum, but can't seem to pinpoint my problem. I received this iMac for my office last March, and everything worked just fine. Lately, for the past 3-4 months, I can turn it on in the morning and everything runs fine.
I turn it off in the middle of the workday, thinking I won't need to use it for the rest of the day.
Of course, something comes up, and I need to turn it back on. When I press the button to turn it back on, nothing happens. Just a black screen and if it's quiet enough, I can hear the hard drive running.
It won't boot until I come back the next morning, almost as if I'm giving it time to cool off.
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Turn off Energy Saver and use Screen Saver instead. Energy Saver is sensitive to certain non-Apple USB devices and may cause such a problem.

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I am having problems with Windows not rebooting after I resized partition to reduce Mac side and increase Windows side. I do not see the BootCamp partition labelled as such while running disk utility. Upon startup, the Windows partition shows up when I boot up while pressing the ALT key. However, when I try to run Windows, it says " error loading operatig system".
I also followed instruction and went through to run gdisk successfully. Results towards the end.
What can be done? Windows still does not boot and It shows ? Suspicious MBR at sector 0.
Below is information based on typical questions asked here.....
diskutil list
/dev/disk0   #:                       TYPE NAME                    SIZE        IDENTIFIER
   0:              GUID_partition_scheme                        *120.0 GB     disk0
   1:                                           EFI                         209.7 MB     disk0s1
   2:                         Apple_HFS Macintosh HD            78.5 GB     disk0s2
   3:                       Apple_Boot Recovery HD             650.0 MB     disk0s3
   4:                   Microsoft Basic Data                         31.7 GB      disk0s4
sudo gpt -r -vv show disk0
gpt show: disk0: mediasize=120034123776; sectorsize=512; blocks=234441648
gpt show: disk0: Suspicious MBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 234441647
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          2         32                            Pri GPT table
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153649656    1269544     3            GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
154919200   17628896
172548096   61892608    4            GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
234440704        911
234441615         32                       Sec GPT table
234441647          1                        Sec GPT header
sudo fdisk /dev/disk0
Disk: /dev/disk0 geometry: 14593/255/63 [234441648 sectors]Signature: 0xAA55
         Starting       Ending
#: id cyl hd sec - cyl hd sec [     start -       size]
1: EE    0   0   2 - 1023 254 63 [         1 - 172548095] <Unknown ID>
*2: 07 1023 254 63 - 1023 254 63 [ 172548096 -   61892608] HPFS/QNX/AUX
3: 00    0   0   0 -    0   0   0 [         0 -          0] unused
4: 00    0   0   0 -    0   0   0 [         0 -          0] unused
sudo gdisk /dev/disk0
GPT fdisk (gdisk) version 0.8.7
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
MBR: hybrid
BSD: not present
APM: not present
GPT: present
Found valid GPT with hybrid MBR; using GPT.
Command (? for help): r
Recovery/transformation command (? for help): h
WARNING! Hybrid MBRs are flaky and dangerous! If you decide not to use one,
just hit the Enter key at the below prompt and your MBR partition table will
be untouched.
Type from one to three GPT partition numbers, separated by spaces, to be
added to the hybrid MBR, in sequence: 4
Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): y
Creating entry for GPT partition #4 (MBR partition #2)
Enter an MBR hex code (default 07):
Set the bootable flag? (Y/N): y
Unused partition space(s) found. Use one to protect more partitions? (Y/N): n
Recovery/transformation command (? for help): o
Disk size is 234441648 sectors (111.8 GiB)
MBR disk identifier: "DELETED INFO"
MBR partitions:
Number Boot Start Sector   End Sector   Status      Code
   1                               1    172548095   primary     0xEE
   2           *     172548096    234440703   primary     0x07
Recovery/transformation command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y
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Warning: Devices opened with shared lock will not have their
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Warning: The kernel may continue to use old or deleted partitions.
You should reboot or remove the drive.
The operation has completed successfully.

So here's what I think happened. Upon resizing the OS X volume, a 5th partition was created. When that happens, diskutil removes the hybrid MBR that's needed to activate the EFI firmware CSM (BIOS emulator) which is still presently used for booting Windows on Apple hardware. Upon removing the hybrid MBR, Windows is no longer bootable. So what you probably did was used Disk Utility to reverse what you did by deleting the extra partition. When you do this, diskutil recreates the hybrid MBR but with the wrong partition type code. It sets it to 0x0C, and therefore thinks it's FAT32, whereas it should be 0x07 for NTFS. Disk Utility will then let you run a disk check on what it erroneously thinks is a FAT32 volume, but is in fact NTFS. If any writes are done, which it appears is the case, it corrupts the NTFS file system.
So this is just yet another Bootcamp data loss story, without any warning in either documentation or Disk Utility whatsoever.
What version of OS X is this?
The easiest, but most tedious thing to do is to totally start over with everything: obliterate the entire drive with Disk Utility making 1 partition only, reinstalling OS X and files from backups, use Bootcamp Assistant to resize the OS X volume the way you really want it, reinstall Windows and restore from its backup. All of that can be done in the GUI.
You might still use the Windows install disk to run Windows startup repair. It might fix the Bootcamp volume. The remaining problem in that case is what to do with the large pile of free space, but I'll make those suggestions later once you get to that point.
If Windows startup repair can't fix the Bootcamp volume, and you don't have a backup, then you'll need to download and install testdisk, and read how to use it to try and find your data. It's an iterative process. Once that's done, while it probably won't fix it and make it bootable again, you'll have a basic backup of files. The remaining thing to do is use gdisk remove the broken Windows partition, make a new one that also includes free space you presumably wanted Windows to have, and make a new hybrid MBR adding partitions 2 3 4. Then reinstall Windows, your apps, and restore your data from backups.
So that's the gist. Ask if you have more questions.

Windows won't boot after 9.1 flash (K8T Neo2-F)

Hello,
I tried flashing to 9.1 to be able to use dual channel mode, but when i try to boot windows xp (sp2) won't start. I just get a blank screen.
I changed the bootorder correctly (1: CD 2:PM Maxtor).
I can boot fine from a CD or floppy when i press F11 or change bootorder.
Also when i try to put the Floppy as first bootdevice it just checks the floppydrive for a bootable disk, then halts.
When the CD is the first bootdevice and HD second, i get a few (about 3) weird colored characters on my screen.
When i try to boot from the second harddrive (40GB on primary slave), i get the message 'Missing operating system'.
I've had a similar problem before when i went from 3.3 to 9.1 and changing the LBA mode on the harddrive fixed that but now it doesn't change.
Could this be because the drive was formatted in non-LBA mode (although i doubt that's the case...)?
Any idea's?
Thanks.
System:
300W power supply (no brand)
MSI K8T Neo2-F (VIA K8T880)
AMD Athlon 64 3000+ (Venice)
Corsair TWINX1024-3200C2 (2x512MB)
Nvidia Geforce 3 (64mb) AGP
Maxtor 6Y080L0 (80GB), primary master
Seagate ST340016A (40GB), primary slave
BenQ CD/DVD writer (16x): secondary master

And what about optimized defaults? We have already found this to be a problem if you don't set that first before setting up the Bios.
I mentioned the PSU as all you listed is watts and that as I say does not help us at all here. However 15a is asking for problems as you have nothing in reserve to operate from is say the PSU gets warm and loses efficiency, which by the way drops fast, or during startup you can have issues as well and may not even know it as this is the time that PSU's are asked for the most power. Also as you have a GF3 vid card, which at the moment is likely saving that PSU from even more stress, you aren't using 12v on that card, but if you upgrade sometime to a better vid card you will certainly go over the power budget that PSU has available and burn it up or maybe more. What I am saying is that we already know from experience here with people having issues that 15a don't cut it.
So now that I have had to repeat that all over again in yet another thread... You shopuld at least have a look at what you already have as needing an upgrade and while hopefully not at the moment as we already know it runs wether well or not, you should considure upgrading it before you do much else with that system. Not that you need to replace it this very moment. I am just making you aware that your already looking at a possible problem at some point there.

Windows won't boot unless a bootable CD is present

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