CPU starts but monitor displays no signal

shreyas133719

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My PC specs:

Windows 8.1
500watts PSU
Intel core i7 870(1st gen)
DDR3 8gb RAM
1TB HDD(No SSD)
GTX 1050 2gb

I just had an upgrade to my old PC, sometimes i turn ON the PC it starts up fine but sometimes it turns ON with all the fans running but i get no POST beep and the monitor displays the message "NO SIGNAL" but on the next day it starts up fine i tried everything like clearing CMOS, flashing the BIOS(jumper), re-seating hardware components on my MOBO, sometimes its starts and sometimes it doesn't is it because my HDD is corrupted or my mobo isn't getting enough power from the PSU or the GPU is causing this?
 

goldstone77

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http://www.coolermaster.com/powersupply/extreme/extreme-power-plus-500w/

It's is a 360 watt power supply split across 2 12v rails. This could be your problem. Can you see if the fan for the power supply is spinning? I would upgrade this power supply. Where do you live so I can try and find a good replacement for you?
 

shreyas133719

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But it says 500watts. yes, the fan for the supply runs well, i live in India, Bangalore city.

 

shreyas133719

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I upgraded my Graphic Card and and added another 4gigs of DDR3 1333Mhz RAM stick to my PC. its complicated, when it runs well i dont see the problem for like months together and suddenly when i try to boot it up in the morning it doesn't boot and sometimes i get the error "Cmos battery error, Cmos checksum error" but i had my CMOS battery exchanged with a new one.
 

goldstone77

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CMOS CHECKSUM ERROR - DEFAULT LOADED. When a CMOS Checksum error occurs during system startup, it could mean that the system has been restored to default factory settings. The CMOS contains data related to BIOS and may have been reinitialized. It may also be possible to fix the problem by reinitialising BIOS.

How long have you had that power supply? The initial power draw might be too much for power supply at times. The recent change to the video card pulls about 65-75 watts. A fan bearing going bad can cause failure to boot. I would take the case off, and start up the computer and make sure all the fans are spinning good. Make sure the inside is clean of dust if you haven't cleaned it in a while using a can of compressed air.
 

shreyas133719

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I am using that power supply from 2010, the fans are running well and the insides are also clean, no dust, i recently had it cleaned.
 

shreyas133719

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I already use a active adapter, to my monitor.


 

goldstone77

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Personally, I think it's the power supply failing. Components of it are failing and causing improper voltage during boot. I would replace it with at least a "Bronze" rating ~450W single rail. Where do you live, and I'll try and find you a power supply.
 

goldstone77

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[PCPartPicker part list](https://pcpartpicker.com/list/cDscCJ) / [Price breakdown by merchant](https://pcpartpicker.com/list/cDscCJ/by_merchant/)

Type|Item|Price
:----|:----|:----
**Power Supply** | [SeaSonic - 520W 80+ Bronze Certified Fully-Modular ATX Power Supply](https://pcpartpicker.com/product/TgW9TW/seasonic-power-supply-m12ii520bronze) | $36.89 @ Newegg
| *Prices include shipping, taxes, rebates, and discounts* |
| Total (before mail-in rebates) | $56.89
| Mail-in rebates | -$20.00
| **Total** | **$36.89**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2017-11-12 13:28 EST-0500 |
 
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shreyas133719

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Yes it was a problem with the power supply, i just a bought a new power supply and my pc is running flawlessly thanks btw.

 

goldstone77

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That's great!
 
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