Question HP PC boots up but no display?

Yasaal

Honorable
Oct 22, 2014
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PC Model: HP Pavilion Elite 400y

Specs:
N-Alvorix-RS880-uATX(MOBO)
AMD Phenom II X4 945 95W (CPU)
12GB DDR3 RAM (2+2+4+4)
INNO 3D GTX 1050 2GB (GPU)
400W PAY
250 GB HDD

It all started when I turned my pc into sleep mode.When I wanted to use it again I noticed that it really didn't go to sleep mode ,system fans are running .
When I tried to use it again ,it is not responding....so I removed power plug to boot it again .I noticed that on booting again the pc starts without power button light and it displays nothing, however all fans are spinning and green light of motherboard is also on .
Before coming on this forum I tried these things but none seems effective:
1.I removed RAM, GPU and cleaned their golden ends with eraser.
2.Used another PSU.
3.Used another GPU.
4.Replaced button cell on the MOBO.
5.Checked whether CPU is faulty, I removed heatsink and then turned on the pc for 5 secs.The CPU begun to heat up.I think it is ok.
6.Removed all RAMs and then booted pc but there is NO beeps from the MOBO (I think there must be).
7.Used each RAM in each slot.
 

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