Hp Pavillion Elite m9040n-Computer turns on but nothing happens

I have an old Hp Pavillion Elite m9040n that runs Windows Vista home 64bit.
I'll try to recall what happened. I always had trouble with the computer running slow, but earlier this year I had some trouble with malware that started causing the computer to crash. I cleared the malware out and because I was still having problems with windows running slow I removed windows vista and installed an older version of Ubuntu(which was also acting funny as far as freezing up and refusing to run programs. One day I got another blue screen of death and it would do it every time I restarted the computer. Now when I start up the computer, the monitor immediately goes to sleep and the computer makes no noise except for the fans running.
Sorry if this isn't enough info, I'm in a rush right now. I'll answer any other questions about the problem if necessary.

Hi , Have you tried to reseat the RAM ( memory ) in your computer ? Let me know if you know how to do this if not i can talk you through it . If a memory module has failed it will stop the computer from starting . Could also be a failed power supply but checking the RAM first is the best way forward. Checkurtech
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I have had this desktop computer for about 2 years. I usually use it almost daily and turn it off at the end of the day. Every few months or so the computer would turn on but nothing would appear on the screen. I would have to hold the power button to turn it off then turn in on a couple times or wait until the next day and the computer would turn on and everything would appear on the screen and work perfectly. Last week, the computer once again turned on but nothing appeared on the screen, except this time, after a week, the computer will now turn on except there is still nothing appearing on the screen. I no longer hear the fans running, however, I hear everything else running as normal. I have unplugged and re-plugged in all the cords multiple times and still, nothing.
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Kelly, welcome to the forum.
When requesting help you should always include the make/model (i.e. p6-xxxx) of the computer and/or monitor. This information is necessary for us to review the specifications of them.
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HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
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ptford wrote:
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Hp Pavillion Elite m9040n-Computer turns on but nothing happens

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