I was installing a dvd drive, unhooked main power supply in computer, now when I turn on computer it says it needs a systems reboot disc can you help

If you're talking about the light blinking on the CD/DVD drive when you try to turn on your system .. that's because it's getting enough power for the disc drive to run it's onboard boot circuits. Does not mean that the rest of the system is getting the power it needs .. could very well be that your main Power Supply Unit (psu) is going out.
Note :: PSU's are one of the most frequently replaced items in desktop systems. Many new systems come under-powered and upgrades that place more demand on the power supply will stress minimal psu units.
When I replace them, if at all possible, I put in stronger ones so they do not stress and wear out as quickly.

If you're talking about the actual Power LED on the computer blinking, its most likely an error. The 8200 has a set of LEDs on the back to indicate various failure codes. You didn't mention beeping so its not a beep code, which exists as well. If any light other than the CD/DVD disc light is what you were talking about, please clarify or visit [Link shown below] :: the Dimension 8200 pdf manual link, codes in it.
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Which operating system ?

there are some you can download

If you computer crashes and your hard drive fails, you can lose a lot of data and spend a great deal of time trying to find all your discs and re installing all of your information.

It can be very difficult to find and re-install your operating system if you do not have the original CDs that came with your computer.

But if you create a recovery CD for your computer, the restore process can be much faster and quite easy.

Put the blank CD in your CD writer.

Click on the Windows Start button.

Click on the Control Panel option.

Click on Backup Your Computer from under the System Maintenance section option.

Click on the Backup Your Computer button on the Backup and Restore menu.

Select your CD drive from the drop-down list and press the Next button.

Click the Start Backup button to begin the backup process.

you might need to use dvd rw depending on the size of the backup

How to Create a Windows 7 System Repair Disc:

http://www.sevenforums.com/tutorials/2083-system-repair-disc-create.html

This will show you how to create a Windows 7 system repair disc to use to boot to the system recovery options if you dont have a Windows installation disc, cant find your Windows installation disc, or cant access the recovery options provided by your computer manufacturer.

or

If you do not have access to either disc: Windows 7 - Repair Disc download

http://neosmart.net/blog/2009/windows-7-system-repair-discs/

a) Insert the Windows 7 System Repair DVD or Installation DVD and reboot.

b) Select the correct keyboard input method and click Next.

Note If you are using the Windows7 Install DVD then at the Install Now prompt (Do not pick the Install Now option) instead choose the Repair your computer option located in the lower left of the dispay.

c) The System Repair tool will search for a valid operating system and will report that Windows found problems with your computers startup options.
Do you want to apply repairs and restart your computer ?

d) Click Repair and restart and reboot again to the Windows 7 System Repair environment.

e) Click Next at the keyboard selection prompt and when the System Recovery Options screen appears verify that the Use recovery tools that can help fix problems starting Windows is selected.

Note that on your Dual Boot system there now should be only one operating system listed.
Click the Next button.

f) Now from the menu list select the Command Prompt option.

g) At the DOS prompt type the following three commands

bootrec.exe /fixmbr

bootrec.exe /fixboot (may return an Eliment not found message)

bootrec.exe /RebuildBcd

h) Close the command prompt window and click the Startup Repair option.

i) The repair process may take some time, so wait until the process completes at which point you will see two messages Windows cannot repair this computer automatically and Startup

Repair cannot repair this computer automatically.

These messages are the result of the radical changes made by removing the other drive.
Ignore the Send/Dont send options.

J) Close this message window by clicking on the X in the upper right corner of the Send/Dont send window.

Next click on the View advanced options for system recovery and support option and from the main menu once again click Startup Repair.

This time the repair process may only that a few seconds and when prompted Startup Repair could not detect a problem, click Finish and run the Startup Repair option one more time, click Finish, and then remove the System Repair DVD and click Restart.

Reboot the computer.

http://neosmart.net/blog/2008/download-windows-vista-x64-recovery-disc/

vista recovery disk
not longer free

hope this helps

Turn on, hold F8 button down until boot menu appears. Download Norton Boot Recovry to disc from another computer. Install in ur CD/DVD drive. Boot ur computer. Or install ur operating system disc in cCD rom drive. Reboot computer, hold F2 button down, modify BIOS boot sequence so CD Rom in 1st boot device. Boot computer, repair or reinstall operating system.

Is it a disc that someone made on their computer and gave to you or is it one you purchased from the store? Computers sometimes have a hard time reading a disc that someone made and gave to you. Try a disc that you purchased and see if it plays it.

See if you can update the driver in the device manager.

Uninstall the DvD Drive from the device manager, then reboot and let it reconfigure everything. Go the Control Panel and under System find the device manager. Right Click on the dvd drive and select uninstall. Reboot.

Reseat the the disc by unplugging the power cord, remove the battery, then turn the laptop over and remove the screw that holds the dvd drive in place. Pull the drive out, then put it back it.

If you are using Windows Media Player try the VLC player.
Try using VLC as your player. Go to www.google.com andin the search box type "download vlc" (without the quotes). Look for the Video Lan download from site www.videolan.org/vlc Downloadand install it. It downloads and installs in 3 minutes or so. It'sa very fast player, smooth and it can play just about any type of dvd formatsand media. It's totally FREE.

IF U HAD THE DVD :

1. Insert the Windows 7 installation disc or USB flash drive, or a system repair disc, and then shut down your computer.
   

2. Restart your computer using the computer's power button.
   

3. When prompted, press any key, and then follow the instructions that appear.
   

4. On the Install Windows page, or on the System Recovery Options page, choose your language and other preferences, and then click Next.
   

   • If neither the Install Windows page nor the System Recovery Options page appear, and you're not asked to press any key, you might need to change some system settings. To learn how to do this, see Start your computer from a Windows 7 installation disc or USB flash drive.
     

5. If you are using the Windows installation disc or USB flash drive, click Repair your computer.
   

6. Select the Windows installation you want to repair, and then click Next.
   

7. On the System Recovery Options menu, click a tool to open it.
   

To reinstall Windows Vista, 1. Backup your data, if possible. 2. Insert your Windows Vista DVD into your DVD drive, selecting the 32-Bit or 64-Bit, depending on the system. If you are not sure, use the 32-Bit DVD. 3. Turn on your computer, press the key that lea you t your BIOS setup, usually the DEL, F2 or F10 Keys. 4. Find your boot sequence options, and set your DVD drive to boot first. 5. Save changes, restart the computer, make sure the DVD is in the DVD drive. 6. Follow the on-screen instructions, entering your product key, and other information requested. 7. Format your main hard drive if installing to first hard drive, or format the partition you are installing to. 8. Select the drive or partition you want to install to and click next. 9. Wait for system to finish install, system will reboot a couple times. Make sure to take out the DVD after the first reboot. 10. Let setup finish, after final reboot, follow onscreen instructions to create a user account, and other options. 11. Customize and put your files back if needed and enjoy!

1) All you need is a *bootable* Windows CD/DVD. 2) Go to your BIOS, choose First Boot device as 'CD/DVD Drive" 3) Second Boot device as HDD 4) Insert the bootable Windows CD/DVD into your CD/DVD Drive and install Windows from it.

Your HD is dead.Think on the possibilities to buy a new one.But look at this:

Check all cards. Verify that all cards are seated in their slots on the motherboard and secured with mounting screws.

Check all connectors and cables. Make sure all ribbon and power cables are securely connected. Ribbon cables are easily damaged, especially at the connector. Try a new cable that you know is good. Make sure no connector pins are bent. Verify that pin 1 on the interface cable is aligned with pin 1 on the drive and host adapter (see Figure 2 on page 6).

Verify jumper settings. Review the instructions in this guide and in your host adapter installation guide. Make sure all appropriate jumpers are installed or removed as necessary.

Check your power-supply specifications. Each time you add a new device to your computer, make sure your cornputer's internal power supply can support the total power demand. If necessary, consult your dealer for a new power supply.

Verify the drive-type settings in the system setup program. The drive-type settings in the system BIOS must not exceed the physical specifications of your drive. Also, the settings must not exceed the limitations set by the operating system and BIOS.

Check for viruses. Before you use someone else's diskette in your system for the first time, scan the diskette for viruses.

• Check all cables.
• Make sure the power supply is adequate for system needs.
• Reboot the computer and listen to make sure the drive motor starts up. If the drive is very quiet, it may be difficult to hear its discs reach operating speed. If the drive motor does not start up, recheck all drive cables.
• Verify that for each drive, a drive-type is listed in the system setup program.
• Try rebooting your computer by pressing the CTRL, ALT and DELETE keys simultaneously. If the drive is recognized after you reboot the system, the computer BIOS test may be completing before the drive is ready.
  One solution is to slow the processor speed during startup. If your computer has a turbo switch, set it to slow speed before turning the computer on. If there is no turbo switch, you may be able to use keyboard commands; see your computer manual for details. After the computer is up and running, return the processor to the fast speed.
  Another solution is to warm-boot your computer after every power-on.
• Check for I/O address conflicts. To isolate the conflict, verify that the drive and host adapter are compatible with your computer. Turn off the computer and remove all the peripheral adapter cards except for the video card and host adapter. If the computer recognizes the drive when you reboot the computer, turn off the computer. Reinstall the other peripheral cards, one at a time, until the conflict reoccurs. After you have isolated the source of the address conflict, you can resolve the conflict by changing the 1/0 address of the peripheral that appears to cause the conflict.
• If Disk Manager has installed the DDO on your hard drive and you have booted directly from a diskette, the information in the boot record for the drive may not have been loaded. Make sure there is no diskette in drive A and reboot.

There are a couple possible solutions to your problem. If the computer will still turn on and load windows, and I assume you are using Windows XP, you can try doing a system restore. To do this, go to Start, Programs, Accessories, System Tools, and select System Restore. If system restore is enabled, you should be able to choose a date in the past when the laptop was working properly and restore the computer to that date. If you want to completely reload windows, you will need a Windows XP installation disc. Load the disc in the CD or DVD player and reboot the computer. You should see a screen asking you to press any key to boot from CD, go ahead and press Enter. You will now enter setup where you can reformat the hard drive and reload windows XP. Follow the on-screen instructions to delete any old partitions, and then create a new partition and format it using NTFS. The windows XP installation will continue after the hard drive is formatted. If, when you reboot the computer with the installation disc in the drive, you are not prompted to boot from CD, you may need to reboot and press F2 or F12 to change the boot selection to the CD or DVD drive so it will load the CD first before it tries to load your original Windows installation.

I have just fixed a computer with a similar problem. The owner installed a new DVD burner (a SATA drive) and every time he inserted a CD or DVD disc, the computer shutdown (mostly, because the front LED was still on and the CPU fan too, everything else just turned off [drives, PCI cards]). It happened in Windows, in Linux (Ubuntu) and even in the BIOS screen, so I discarded an OS problem. Also happened while booting if a CD or DVD was already inserted in the unit; as soon as the drive LED blinked, the computer crashed. After checking the obvious, I did three final tests:

1) try the DVD unit in another computer (it worked);
2) try the DVD unit with the power connector only, with the data cable disconnected (it shutdown);
3) try the DVD unit with the power connector from and external power supply, with the data cable connected (it worked).

By this point, it was obviously a power supply problem. I checked the power supply unit (PSU) and discovered it was pretty small (250 W). So I installed a more powerful one (350 W) and then it worked.

I checked with a wattmeter and it seems this DVD drive increased the power consumption by 25 watts when started to spin the disc. I really don't know if that is normal (taking 25W to start spinning the disc) or if this drive has some defect, but it seems the previous PSU could not provide that extra power and shutdown some of its output (but not all).

So, if you have this weird problem, maybe checking the power supply and testing with a bigger one may help.

Regards,

MV