Solved Boot problem with RAM

September 20, 2012 at 12:21:37
Specs: Windows 7 premium 64 bit, i5 core (using one 4 gb ram)
After some months of uneventful running of my computer (home build) problems occured. My computer would stop, turnoff and try to turn back on but black screen would show "unable to find boot device etc.". Eventually I was able to get into BIOS and found no hard drive listed in BIOS. My hard drive is a SSD. It somehow disappeared according to my BIOS.

I thought the problem might be the motherboard but when I removed the motherboard and tried to repair this problem I discovered a second problem the only way I could see the motherboard (Asus) on the monitor was if I used one stick of memory and only in the slot fartherest from the CPU. This problem happened on two Asus boards eliminating the board as a source of the problem.

I loaded my OS (windows 7 premium 64bit) on a regular hard drive (no SSD) installed one memory stick and the computer works fine it does not turn off as before.
My best bet is something may have happened to my power source. I live in an area that has many electrical interuptions in service perhaps one had an adverse affect on the power souce (Corsair 750 watts).

Any thoughts??

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September 20, 2012 at 13:24:36
Have you MemTest-ed your sticks (both when used individually and simultaneously)?

Google is your friend


Have a GREAT day!

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September 20, 2012 at 16:33:19
I have 4 4Gb sticks any of the four when placed in the slot furthest from the cpu work and the computer boots so they are all good.. When I try any two the computer will not boot.

With one stick the computer starts directly up and boots. With two it starts up and then hesitates to a stop but then starts again but does not boot.

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September 20, 2012 at 18:05:35
✔ Best Answer
Memtest86 when used from a bootable CD will let you test your memory for problems without needing to access your hard drive or Windows. It will let you test one at a time and all together as long as there is nothing wrong with the motherboard or BIOS.

Especially for areas with power problems, it is important to get a decent UPS (Uninterruptable Power Source) which uses an internal battery to prevent sudden power drop offs. They smooth out power fluctuations much better than just a surge protector. All but the cheapest offer a way for the UPS to safely shut down your computer if it is unattended and you do not shut it down safely before the battery runs down below a certain level. It will prevent a lot of hardware issues/damage.

You have to be a little bit crazy to keep you from going insane.

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September 21, 2012 at 05:28:02
Definitely food for thought and a new approach for me. I have created a bootable CD with memtest and will try on all my memory sticks.

Absolutely my fault for not having a UPS go between in my system. This is information that I will pass along to friends who definitely had problems with power surges and computers.

It's funny because I am a Home Theater guy and of course I have expensive power conditioners in my system.

Thanks for your input.

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September 21, 2012 at 09:05:36
A single stick of memory may work differently that a dual set of even triple set. They have to work in the manner and positions that they were designed for and they NEED to test properly for days and days under memtest.

The bios and hard drive deal has nothing to do with memory (well, 99.999%). No hard drive is usually different deals.

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