Pc fans start but no light in power button

Looks like a hardware problem. I think you need to get the machine serviced.

There is a small shiny coin cell battery in your computer.  It is almost always the standard 2032 .  This battery is recharged by your computer but has a life of about 5 to 8 years.  This battery keeps constant power to the memory that contains today’s date & time as well as a lot of the features in your system.  When it starts to fail, it commonly will start asking you to re-enter the date each time you startup.

For Notebook PCs it is likely going to be difficult to find the battery and will require a special part, requiring the services of a technician.

For Desktop computers, this is an easy change:

1. Unplug the power to your computer
2. Hold the ON button in for 7 seconds
3. Lay the computer on its side with the side where the wires are, down
4. Remove the side panel
5. Peer in there and you will see a shiny silver battery about 1/2″ in diameter.  It looks like a quarter.  That’s the battery
6. Go to just about any store and buy a 2032 coin cell battery.  They cost less than $5
7. Find a very tiny flat bladed screw driver (like one used for your eyeglasses)
8. Very carefully pry the battery loose.  It will pop up so be prepared to catch it.
9. Press the new battery in with the embossed markings on the up-side facing you.
10. Close the side panel
11. Turn it up vertical again
12. Start up the computer

Your computer will now need to have the date and time set but only once more — at least for this 5 years.  You need to enter the BIOS, which you do by pressing F2  immediately on startup  in most systems to get to the place where the date and time is stored.  Put in current time and date.  Close this the way it tells you to save what you did.  You may hear more whirring and chugging while some of the stuff is again set up.

Once Windows is up and running again

1. Click once on the time/date in the bottom right corner
2. Click on Change date and time settings
3. Click Internet time
4. Click change settings
5. Select time.b.nist.gov and click the Update button — this will synchronize the computer clock with the US govt time labs system
6. Close

Have you read my post even ?

There is a small shiny coin cell battery in your computer.  It is almost always the standard 2032 .  This battery is recharged by your computer but has a life of about 5 to 8 years.  This battery keeps constant power to the memory that contains today’s date & time as well as a lot of the features in your system.  When it starts to fail, it commonly will start asking you to re-enter the date each time you startup.

For Notebook PCs it is likely going to be difficult to find the battery and will require a special part, requiring the services of a technician.

For Desktop computers, this is an easy change:

1. Unplug the power to your computer
2. Hold the ON button in for 7 seconds
3. Lay the computer on its side with the side where the wires are, down
4. Remove the side panel
5. Peer in there and you will see a shiny silver battery about 1/2″ in diameter.  It looks like a quarter.  That’s the battery
6. Go to just about any store and buy a 2032 coin cell battery.  They cost less than $5
7. Find a very tiny flat bladed screw driver (like one used for your eyeglasses)
8. Very carefully pry the battery loose.  It will pop up so be prepared to catch it.
9. Press the new battery in with the embossed markings on the up-side facing you.
10. Close the side panel
11. Turn it up vertical again
12. Start up the computer

Your computer will now need to have the date and time set but only once more — at least for this 5 years.  You need to enter the BIOS, which you do by pressing F2  immediately on startup  in most systems to get to the place where the date and time is stored.  Put in current time and date.  Close this the way it tells you to save what you did.  You may hear more whirring and chugging while some of the stuff is again set up.

Once Windows is up and running again

1. Click once on the time/date in the bottom right corner
2. Click on Change date and time settings
3. Click Internet time
4. Click change settings
5. Select time.b.nist.gov and click the Update button — this will synchronize the computer clock with the US govt time labs system
6. Close

Ok i under stand that but removing all cables and then pressing power button fixed my sleep problem but now i can't boot into it after i had shutdown my pc.

Also my battery hholho is broken so my date changes every time I log in . Would this be causing the issue.

That button you are pressing and holding for 30 seconds is the ON button.  There is no OFF button on a PC.

When Windows goes through its normal shutdown, it does a lot of things.  When you power it off that way, it is not able to go through those steps.  Each time you do that, there is a chance that you will corrupt the system and it will not be able to start again later.  It's a bit like Russian roulette.  Keep it up and you are likely to cause your system to completely fail.

Best advice is to shut down the sleep function and simply shut your system down in the normal way.

The “sleep” or “hibernate” functions that  run by default in Windows 7 can prove to be problematic.  I advise my clients to restrict hibernate/sleep functions for usage only in absolutely needed circumstances.  It is commonly problematic and seldom ever fixed.  Myriads of causes you can spend weeks trying to find.  Just not worth it.

FIRST: If you are running a desktop PC, shut down all sleep and hibernate functions.  They are of no value and will cause you problems eventually.  But, for some notebook PCs, where the computer is used in a truly mobile sense, where house power is not always available, you need these functions to extend battery life.

Background:  The concept of sleep/hibernate was designed to extend battery life.  If you are not running on a battery or never do, the very idea is quite useless.  If you are doing it because your computer takes a long time to startup, fix that problem.  Under normal circumstances if you are finished using the computer and do not plan to use it again for at least several hours, shut it down.  Leaving it running continuously is a sure way to shorten your computer’s life

You can change how these functions behave here:

1. Start globe
2. Type Power options in the text box that pops up
3. Desktop computers:
4. Set all hibernate/sleep functions to NEVER
5. Notebook computers:
6. Again, set all hibernate/sleep functions to NEVER, EXCEPT when it is battery powered.
7. In the Power Options window, Click Change Power Settings
8. Change Advanced Power Settings
9. Set hard disk to turn off after 20 minutes of non-use
10. Under Sleep, several settings:
11. Sleep After NEVER
12. Hybrid after: Never