My computer does not start unless I restart it multiple times
There is a feature in the newer versions of Windows called fast startup or hybrid sleep that can sometimes cause this issue. Disabling this feature may solve your problem. To turn off fast startup, follow the steps on this page.
Computer is not passing POST
If your computer is not beeping or beeping irregularly when it is not starting, see the POST troubleshooting steps.
Note: A computer may not be passing POST because of any of the following reasons. However, the beep code may help isolate what hardware is causing the problem.
Bad power supply or inadequate power supply
A bad, failing, or inadequate power supply is often the cause of this issue. If the hard drive is not getting enough power during the first time the computer starts, it cannot spin the hard drive platters fast enough to start the computer. However, if you restart the computer two, three, or more times, because the platters are already spinning, it can get the drive up to speed and able to boot off the drive.
If you are encountering this issue after installing new hardware on a computer, it is also possible the power supply is no longer adequate. For most computers, we recommend you have at the least a 300 to 350-watt power supply. If you have installed a new or additional video card, an even bigger power supply may be needed. Video card power requirements can be located by performing an online search or visiting the manufacturer's website.
Note: If you have a laptop computer, and you are powering up the computer without a power cord, make sure it is not a lack of power from the battery by connecting the power cord. If the computer powers up fine when plugged in, replace the main battery.
Our first recommendation is to replace or upgrade the power supply in the computer.
Bad hard drive
This issue may also be a failing or bad hard drive. Similar to the previous issue, if there is a failure within the hard drive that is causing the disk platters to not spin up fast enough during the initial power up, you may encounter this issue.
If after replacing the power supply you continue to experience the same issue, it is likely that the hard drive is at fault, and we suggest replacing the hard drive.
Other hardware issues
Although not as likely, other hardware can cause this issue to occur. Below are some additional hardware pieces that can fail and cause your computer to repeatedly restart.
Replace the IDE/EIDE interface cable connected from the motherboard to the hard drive. If the cable is defective, it could cause various issues with your hard drive.
Finally, if the computer continues to exhibit the same issue after following all of the above steps, it is likely that the motherboard is defective and needs to be replaced.