The Computer Won't Start.

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If no error message is displayed, and the computer cannot start into Windows, do the following to disable the automatic restart feature in the Advanced Boot Option. Turn on the power and press f8 or f10 or f12 or f2 to open the Windows Advanced Boot Option screen. Select Disable automatic restart on system Your problem will be solve

If Computer not responce then Sometimes issue on Extension Board or power supply So, Firstly check proper power was there or not
then check step by step process.
For general knowledge purposed
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1)NO signal issue- screen or monitor is okay or not. Also check (VGA)Video Graphics Array Cable or HDMI(High-Definition Multimedia Interface) cable is okay or not Means Display Cable
2)NO power PC- check the smps is okay or not - if faulty then repair or replace. Short the SMPS and check. Short means not damage the SMPS. If working fine SMPS means issue from another parts. If you dont have any idea then pls do not do any process. Pls contact to the technical support Assistance.
3)No power or beeps sound making noise - Check the mbrd (Motherboard)is okay or not - if faulty then repair or replace
4)No display - Check the Ram okay or not - clean the Ram. Again insert that before slot or another slot .if faulty then repair or replace. But your application size is large and your memory size is not sufficient then definately your pc will be gone for hang or something reboot or hang. you need to take action coz that did not have sufficient memory space for load or run your file or manage another application at that same time coz some application automatically working mode on background process.So do u load or use heavy software and it needs to upgrade your RAM. Firstly check particular that application how many gb's RAM reuired. then upgrade later.
5)OS not Boot then try for repair the OS. Repair not done then try from reinstall the OS from DVD,HDD,USB Pen Drive.
If not solved the issue then Check through the CHDKDSK
if not solved from CHKDSK then replace the HDD and Media load and configured then check your issue is solved or not.