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Old Motherboard GTX 660 Problem

Feb 8, 2015
30 (0.02/day)
Hey guys what's up?
So here is the issue i am having at the moment , I have an old PC that i want to give to my little brother, this PC has
M/B : GA-945PL-S3P
RAM: 2GB ddr2
GPU : GT 640
PSU : 650 W Deepcool ( added new one)

So problem persists in the case when i switch GT 640 ( this one does not require power supply) and put GTX 660 TwinFroze III OC 2 GB ( that has 6 Pin connector) when i plug this to my Monitor using HDMI Cable i get a blank screen, even can't see the BIOS , just black screen, updated the BIOS using @bios, But could not update from Q-flash in BIOS because it only sees the Floppy (who uses floppy now , and USB Drive is not recognized in Q-FLASH) , but the problem still exists, what can be the issue here?
Old GT 640 also was connected with HDMI to Monitor, but works, however when i plug this GPU it goes Blank, i know 1000% that this GPU works because i have tested on my main PC
Aug 14, 2012
173 (0.07/day)
System Name "Big E"
Processor I5 2400
Motherboard Intel DQ67OW
Cooling Scythe Samurai ZZ
Memory 4 X 2 Gb Kingmax 1333
Video Card(s) HIS HD 5770 Turbo
Storage samsung F3 500 GB
Display(s) Acer S271HLBbid
Case "Big E"
Power Supply Gembird 450 W
Mouse Generic
Keyboard Generic
Software W10 X64
Benchmark Scores Nothing worthy to mention
usually when a gpu has extra power connectors it will not start without them.Plug in the necessary connector.

edit :and stop fashing video card bioses.
Feb 14, 2012
864 (0.34/day)
System Name No name
Processor i5 8600k@4800Mhz 1.22v
Motherboard Gigabyte Z370 UD3P
Cooling Noctua U12P
Memory 16GB 3000Mhz
Video Card(s) Evga 980Ti SC + Accelero Xtreme III
Storage Kingston AV400 256GB, WD30PURX
Display(s) Asus MG279Q and AOC q3279vwfd8
Case Regnum RG4F Frosty White
Audio Device(s) XFI Music
Power Supply Seasonic G650 650W
Mouse Cougar 600M
Keyboard Asus Strix MX Brown
Software Windows 10 Pro x64
Benchmark Scores 5948 3dmark TimeSpy


The Exiled Airman
Jul 2, 2007
24,285 (5.76/day)
System Name PCGOD
Processor AMD FX 8350@ 5.0GHz
Motherboard Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory 16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s) AMD Radeon 290 Sapphire Vapor-X
Storage Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s) NEC Multisync LCD 1700V (Display Port Adapter)
Case AeroCool Xpredator Evil Blue Edition
Audio Device(s) Creative Labs Sound Blaster ZxR
Power Supply Seasonic 1250 XM2 Series (XP3)
Mouse Roccat Kone XTD
Keyboard Roccat Ryos MK Pro
Software Windows 7 Pro 64
Sometimes if a card is not fully and squarely inserted it can cause this. Typically to verify the card works is to breadboard the rig, other solution is from @droopyRO