Question about Compaq Presario 7478 PC Desktop

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I had the Internet pulled up and it froze I rebooted the computer and when it was restarting a black screen came up and said operation system not found .... What can I do

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  • Compaq Master
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Take it to a local pc repair company.

Posted on Jun 09, 2013

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Posted on Jan 02, 2017

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SOURCE: Black screen

My next step would be to see if there is a CPU fan and find out if it is spinning.  The problem sounds like a bad CPU, which is usually caused by a bad fan.  
Are there any beeps when you try to start it?  If the answer is yes, then it is probably a bad video card or motherboard.  
If there are no beeps, spinning fans, or lights turning on, it could be a problem with power.  You changed the power supply, so the next thing to check would be the cables all the way from the wall to the motherboard.  You also should verify that the power switch that is actually built onto the power supply is set to on before you try the other power switch on the front of the computer.

Posted on Jan 26, 2009

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1 Answer

Bios black screen


Did You Check to See If Memory is in correctly ?you might have dislodged them by accident please check this !! Can you get back into bios there must be a reason for the black screen like Memory is the computer beeping ? What you can do is use a friends laptop or computer and create a recovery disc on there computer then put that disc into your laptop or you can borrow there windows disc.
Boot Manager:
Windows failed to start. A recent hardware of software change might be the cause. To fix the problem:

1.Insert your Windows installation disc and restart the computer.
2.Choose your language settings, and then click "Next".
3.Click "Repair your computer."

If you do not have this disc, contact your system administrator or computer manufacturer for assistance.

Status: 0xc000000f

Info: The boot selection failed because a required device is inaccessible.
(more Info Please)

Sep 18, 2017 | Toshiba Satellite Computers & Internet

1 Answer

Tablet froze in the middle of restarting and the screen wont respond


Wait till the device runs out of battery (or pull out the battery) then try to reboot.

Nov 30, 2013 | Samsung Galaxy Tab 2 7.0

1 Answer

My computer froze in the middle of playing a game. I rebooted the computer and now a black screen comes up an it says Operating System cannot be found.


The problem is caused by corruption in the window files or there is a hard drive issue. Remove the hardware and reseat it back in place, sometimes this will cure the problem, if no change! use the recovery disc to reload the operational system if available. The last resort is to have the hard drive tested to see if it can be salvaged before replacing it.

Jun 24, 2011 | Alienware PC Systems Computers & Internet

1 Answer

I was on Facebook and suddenly my screen froze and I can't do anything? How can I restart with out disconnecting?


If its only the browser that froze (e.g. Firefox, IE, Chrome, etc.) then you can try refreshing the page by clicking the refresh button or f5. If that doesn't work, then try closing the browser, restarting it, and then navigating back to Facebook.

If the whole computer froze, you can try ctrl-alt-del on Windows, apple key-option-esc for mac, and ctrl-esc on linux to try to kill any locked up programs, or just do a hard reboot of the computer itself.

Hope this helps!

May 25, 2011 | Computers & Internet

1 Answer

Cant reboot - it started when the internet froze and i did ctrl atl delete and ended prosces for expoler, then computer froze so i used ctrl alt delete to restart computer, when computer restarted it...


Good day sir/maam, the reson why it froze is caused by a bad memory module, you may need to replace it. Open up your computer and locate the memory modules, remove all memory modules and bring it to a computer vendor for testing. or if you have the cash, better buy a new one. make sure that what you install on your PC be it tested or new is good.

Sep 27, 2009 | Dell Dimension 2400 PC Desktop

1 Answer

Screen black on reboot


start the computer and when the computers splash screen shows (dell) etc. tap the F8 key repeatedly until you see the multiple startup choices. Scroll to "safe Mode with Networking" and select it, you will see the operating system listed as the target operating system, click that (hit enter) start in safe mode. When it boots do you see the screen with no problem? if so then the resolution may be wrong on the normal start up. On the dektop in a clear area free of icons, right click and scroll down to properties, click on settings, then move the resolution slider to either 800 X600 or 1028 X 768. click on yes to change the settings, restart the computer by hitting start > Turn off computer > restart. Reboot it normal mode (just let it boot as you would normally) If you can see the screen, you are all set, if not there is another issue to deal with.

Sep 03, 2009 | Computers & Internet

1 Answer

Lap top screen is black


If you are running with XP try switching the unit on and pressing F8 while the computer is booting up

This should put you into Safe Mode

If that works go to Start , Accessories, System Tools ,System Restore and if the shop did the right thing when they built it you will have the System Restore function running
Ask the machine to do a System Restore and it should give you a number of dates to restore to, pick on that is a few days before the last update and let it roll

Jun 02, 2009 | Acer Aspire One PC Notebook

1 Answer

Laptop is running but screen constant black


it seems the sudden loss of power fried the screen...or it could be the video card that might have downed.  always try to use keyboard combos like crtrl+alt+del or alt F4 before resorting to such violent measures :( 

Feb 04, 2009 | Everex StepNote VA4300M Notebook PC

1 Answer

Not Rebooting


when you turn on pc press f 8 about 4 seconds later and choose start windows with last known good configuration.alternatively if youre new to all this turn on pc and repeatedly press f 8 your system with detect a stuck key but send you to the same place.
you could try start in safe mode wait until it boots and then restart pc in normal way you should

Mar 02, 2008 | Toshiba Tecra A4 Notebook

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