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My acer monitor keeps saying "no signal" ?!?

Long story short: my mom bought a new monitor because my computer screen kept saying "no signal" and I thought that the monitor got old and stop working (hp pavillion 2009). and now my mom bought a acer monitor and I hooked it up to my hp tower , and the screen still says "no signal". Nothing will work. The blue button just keeps blinking. ive tried every basic thing. my mom bought A new video plug and it still didn't work. I think its the video signal input on my hp tower, if so, how do I fix it? 10 points

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