Monitor getting no signal

Given is the details of my institute's pc which is not booting and monitor is showing the message " monitor getting no signal" and i can solve the problem for whic i have to open the cpu but the system is in warranty. kindly help, also sending the same to service station and getting it repaired will be a process of at least 15 days.
Windows 7
HP Elite 7100 MT PC
Sl.no.-INA110GM7
Product no.-WJ045AV

Hello chf,
When you boot up your computer a message on the monitor displays that it can't get a signal. The issue could be a few things so we need to start ruling things out
1. Try another monitor on your computer
2. Try another cable
3. Try a different type of cable if your computer has multiple connections
Are you using integrated graphics or is it a discrete graphic card, if discrete which one?
Did it used to work and just stop one day or has it never worked?
If I have helped you in any way click the Kudos button to say Thanks.
The community works together, click Accept as Solution on the post that solves your issue for other members of the community to benefit from the solution.
- Friendship is magical.

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Just for reference, here is the summery for SINGLE USER MODE as well as VERBOSE. It would be better if AppleJack included this with their "Read Me," since it is an important, required step.
Summary
You can use key combinations to start up the computer in either single-user mode or verbose mode. These may be used for troubleshooting or software development.
Products Affected
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Could be a bad cable or bad Thunderbolt port.
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@Steve_z3_6603
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"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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Monitor getting no signal

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