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Computer stops recognizing hard drive?

So, my computer's been failing recently. This is what happens:
I'm using my computer, and suddenly, the screen turns black. The hard drive light doesn't blink or anything. I try to turn the computer off by holding the power button down, but doesn't work. I have to unplug the power chord from the power source. If I restart the computer immediately, it won't start, and the screen remains black. The hard drive light blinks a couple of times, and then nothing else happens. Not even BIOS screen or anything. I have to wait a minute or so before restarting it, and it boots normally.
I recently changed hard drives, and this hard drive is new, so that's not it. It's not a heating issue because this has happened 5 minutes after turning the computer on.
Any ideas? Could it be motherboard? RAM?
Thanks in advance!

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All Answers

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It sounds a lot like

In reply to: Computer stops recognizing hard drive?

It sounds a lot like some of the early symptoms of bad caps (google it) which basically means new motherboard. If you still have the old HDD around, you could try putting it back for a day or two to see if the symptoms remain or vanish. It's not out of the question that the new HDD is defective.

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To furnish a diagnosis....more information is needed.

In reply to: Computer stops recognizing hard drive?

When you created your post, the FORUM TEMPLATE contained RED TEXT suggesting you provide:
(1) the PCs/Laptops manufacturer's (mfg's) NAME; i.e. "HP"
(2) the mfg's SERIES; "Pavilion" (very important)
(3) the mfg's complete MODEL number; 15-e006se (critical)

In addition, knowing whether it's a DESKTOP (including Slim-line or SFF) or a LAPTOP and whether
it's 10 years old, 10 months old or 10 days old and the primary use...GAMING, PHOTOSHOP, AUTOCAD,
or general purpose Is significant to those who try to help you.

Without the info suggested above....we're more in the dark about your PC than you are.

Please take a moment to provide the suggested info so that you can be helped. The better the
detail, the better chance you'll get pertinent advice/answers vice wild guesses.

NOTE: If you have a CLONE vice a PC made by Dell, HP, ACER, Gateway, etc., please provide complete
Information about the motherboard, the CPU, the GPU (video card) and the power supply (PSU).

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Computer specs

In reply to: To furnish a diagnosis....more information is needed.

I built the desktop in December 2011. The motherboard is GIGABYTE GA-990FXA-UD3, cpu is AMD 1100T, 16 Gb of Corsair Blue DDR3 RAM at 1600 Mhz, and the vcard is a radeon 6950. I use it mainly for gaming and programming. Hard drive is a 1TB seagate drive, bought two months ago. Before that, I was using another seagate HD, but that one was having issues with bad clusters (HD was around 7-8 years old). Everything is mounted on a cooler master tower with 3 fans (apart from the CPU fan and power source fan). My room is fairly cool, and my temperature indicator doesn't indicate anything alarming.
Something I forgot to mention is that I can go hours and hours and the computer behaves normally. Othertimes, it all happens 5 minutes after starting the computer. Yesterday, this issue happened around 4 times, with varying times.

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