Are u using windows xp? Press F8 while booting then choose safe mode. Maybe there's a faulty software or driver then u need to remove it. Even viruses can be the cause. If this doesn't help, try cleaning or replacing the memory module or reformat your drive. this should fix it.
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It sounds like you have corrupt kernel files that allow the system to boot properly. if your phone just sits at the boot logo then something is corrupt. You will have to find the phones OS firmware file online, and put the phone into Disk Mode/Advanced Mode, and either find software you can access the firmware through on your computer, or you will need to take the working firmware file you find online, load it onto a micro SD card and then load the firmware onto the phone from there.
To access this mode (Disk Mode) on your phone do this:
1.Power off your phone
2.Press together volume up + home button (little house)+ power button
3.When Samsung logo appears releases your fingers from the buttons.
4. You will then see a list of options you can select, SD card boot, or SD card firmware upgrade or something along those lines.
From there you can load the proper working firmware to your phone from an SD card, or from the vendors software that can access the phone on a root level.
If the above wasn't an issue, then you may just need to charge it fully and the boot, or leave it on your charger then boot up.
try going into the bois of the computer by tapping f10 key on startup, then arrow over to advanced, arrow down to boot sequence and make sure boot from hard disc is first, you could change sequens by hitting enter jey or space bar
Can you still see the logo which you usually see when it was still working just fine?
There are two process right after you pressed on the power button.
1. POST 2. BOOT
POST (shows up the computer's logo//eg. ASUS, DELL) is the first process that the computer does. It checks all hardware parts in the computer - if the hardware parts in your computer have no problem then the computer proceeds to BOOT.
BOOT happens after the POST process. This is the final booting procedure. After POST or Pre Operating System Test. The computer loads up the operating system that's why you can see the Windows logo this time.
In fxing your issue, you have to identify which causing it. You will know that by knowing if the issue happens during POST or BOOT. If you can still see the computer's logo eg. ASUS, DELL or whatever computer you have then it's not a hardware problem.
If you see the logo and you don't see the windows logo, then it's a software issue.
Please observe that and let me know which part has the issue.
The Dell logo you see at the time booting is the logo of your motherboard manufacturer. It uses the image associated with the program that helps you in booting your computer. If you want to change it, you should have proper knowledge of computer programming and IT. All you need to do is to identify the proper programs associated with the Dell logo and then hack the corresponding .exe or .dll files and replace the image with your own one in correct image format.
Go check the connection of the hard disk, try to remove the ide or sata cable and also power supply connection then connect again and reseat properly the ide/sata cable.
Restart your computer.
If this will not work, try removing the hard disk before booting up your computer and see if this go beyond the logo. If this goes beyond logo then hard disk is faulty. May need to partition and reformat thoroughly. Or replacement.
If you mean after the computer performs the self test the screen goes blank and stays blank, eventually turning off you are having a hard drive problem. When the computer boots you should see an E-Machines logo and/or a self test on the screen. That is done by the motherboard as part of every boot up. After that the motherboard passes control to your boot device and loads your operating system. If your computer stops booting at that point, your boot device is not working properly. That could be caused by many things - virus, hardware failure, power outage.
If you really mean you see nothing at all on the screen when you press the power button your computer simply is not working at all. Open the case, blow all the dust out of it and reseat all components you can, then try again.