After a CMOS removal and reinstall on my motherboard, my pc will not boot up.?

Question

I did this to fix the power issue of my PC (in which it would turn on and then turn off directly afterwards) and now it wont turn on. What is the issue (AKA what should I fix or replace?)

Answer 1

After removing everything and putting it back in the computer didnt start up. we just assumed it may of been bad so we did it to another and the same problem occurred. This really sucked and scared me it turns out it had nothing to do with me. What you need to do is remove all the cables from the pc remove the cmos battery hold the power button for a long time. a minute or two the longer the better. then reinsert the cmos battery and do the same thing again. then try. it sounds like you reset a setting that the computer really, really needs put back how it was.

Answer 2

When i was in college we had to take apart a pc and put it back togethor. before me we didnt take out the motherboard but i was the first student told to do this. After removing everything and putting it back in the computer didnt start up. we just assumed it may of been bad so we did it to another and the same problem occurred. This really sucked and scared me it turns out it had nothing to do with me. What you need to do is remove all the cables from the pc remove the cmos battery hold the power button for a long time. a minute or two the longer the better. then reinsert the cmos battery and do the same thing again. then try. if this is like my situation it will work if it does not recheck all your cables and make sure the motherboard is grounded to the chassis.

Answer 3

Disconnect everything from the motherboard except the ram and hard drive. If you have a known good hard drive, remove the one install and install the other one. Some power supplies need a hard drive to fully turn on. If the motherboard has on board graphics, enable the on board graphics in the BIOS. If it does not have on board graphics then you will have to use beep codes to diagnose it. The only thing you want plugged in is the ram, keyboard, known good non bootable hard drive, and power supply.



This link helps you understand beep codes.



http://pcsupport.about.com/od/nonworkingcomponent/ht/beepcodestb.htm



Turn on the system and see what it does. Do you get a display from the on board display or a series of beeps. If you have on board graphics then you should get a message that you do not have a boot device if you install a different hard drive. If you do not have on board graphics then you should get a series of beeps telling you that you have no video. If you get nothing when you turn it on look at the diagnostic lights and see what they tell you. You have only three parts that could be causing the problem.



If you were using beep codes and it turns on then you can shut down add the video card. Turn it on and see what messages you get. At this point it should display no hard drive or no boot device.



If you were using onbroad graphics you should disable them, shut down and add the video card. At this point it should display no hard drive or no boot device.



At this point add the hard drive. If you have gotten this far then you can add the DVD and try to load Windows.

Answer 4

A friend's computer was having a similar issue, but in that case the processor was probably overheating and turning the PC off to keep it from burning up. Replacing the processor's heat sink and fan solved the problem, but there are probably many causes of similar symptoms in many cases.

Answer 5

First check that the ePROMs are correctly installed. It is possible to install them the wrong way around. There is a dimple near pin one on the chip and a mark at that end of the holder.



If that's not the problem, you've probably zapped them. You did use an antistatic workstation? If not, you need new ones (and an antistatic workstation for installing them)

Answer 6

Let me guess you updated a bios and now you have blackness! Well freind unless the PC is worth $200 to fix its now a brick!



The only fix is to take it to a shop and have the bios chip replaced or reflashed you will get off cheaper with a new mother board

Answer 7

If you can get as far as BIOS, it sounds like you reset a setting that the computer really, really needs put back how it was.