Test all leads that attach to your hard drive including electrical extensions SATA the leads from your (motherboard to your hard drive) make sure they have a secure dust free connections and are not faulty or just replace them they could be faulty make sure all leads that are attached to your drives dvd\cd have secure connections and are not faulty even something as small as faulty fan lead can cause you problems computers need all of the data and power to travel through every working device and to have an end for a computer to be able work properly a motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive check all electrical extensions make sure they are securely seated even the cd/dvd drives need to have current go through make sure these devices are working check the CPU central processing unit make sure it has thermal paste and dust free secure seating also check your computer ram modules and cmos battery make sure it has charge and they are dust free and securely seated some motherboards cmos batteries are soldered in
hope it helps
SOURCE: lenovo y510 wont start in normal mode (xp)
For the Lenovo to to start in the safe and networking mode, and then not have a display when you attempt to boot it in normal mode, I would follo the these steps:
Boot in networking mode, and then go to the Lenovo site and download the most current display drivers. Since you are able to operate as described above, I would start here first. Once you have successfully downloaded the most current drivers for the video on your system, BEFORE you leave the Lenovo site, check your system against the listed bios upgrades. I believe you may find you need to upgrade your system firmware. If so....download the upgrades you need, and finish the display drivers updates as discussed above, and keep the fresh firmware updates set aside and see if the display driver updates allow you to boot normally.
If so, once you have a normal boot, backup your systems RIGHT away! The next step is to then carefully read the docs about how to update the firmware. Sometimes this will require a floppy drive, if so, you can most likely either pick up a USB one very cheaply or perhaps borrow one. At any rate, make sure your system is backed up fully, and preferable with a restore point, (if you are able with XP?)
Try these measures, if it is successful I would love to hear that from you by way of a testimonial. If you are not - please return here for further assistance. I have additional help for you - but I do not think at this time you have a hardware problem.
Have a great day!!
Safe mode is a troubleshooting option for Windows that starts your computer in a limited state. Only the basic files and drivers necessary to run Windows are started. The words "Safe Mode" appear in the corners of the display to identify which Windows
mode you are using. If an existing problem does not reappear when you
start in safe mode, you can eliminate the default settings and basic
device drivers as possible causes.
If you don't know the cause of the problem, you can
use the process of elimination to help you find the problem. Try
starting all of the programs you commonly use, including the programs in
your Startup folder, one by one, to see if a program might be the
cause of the problem.
If your display works in safe mode then you have a video driver issue or virus or software issue.
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