No boot after upgrade to Win 7- a coincidence?

  Andanotherthing 14:24 15 Dec 2011

About a month ago my Medion 8822 PC refused to boot at all. The light came on briefly and then went out, not even getting to the bios stage. After much thought I remembered that it used to be very slow booting if the Medion external hard drive that fits in a bay on the top was connected. I slid it out of the connectors and the pc (Vista Home Premium then) booted up with no problems.

Having just loaded Win 7 Home Premium and had the pc restart several times during that process I was surprised to find that the next day - on the first 'cold' start we were back to the no boot problem again. A co-incidence? No beep codes that I can hear. Have taken out memory modules and swopped them around and tried them one at a time - nothing. The motherboard is a Microstar MS 7318. Anyone get me out of this one?!!

  Fruit Bat /\0/\ 16:01 15 Dec 2011

Does sound like a failing PSU If renewing a PSU check:

  1. The physical size of your PSU, some are hard to replace due to being a non standard size.

  2. The amount of power need from the PSU don't skimp.

  3. The correct connections for your equipment

1. Physical Dimensions

Besides the specs and form factors, the physical dimensions are also important factors in selecting a compatible power supply. Here is an outline of the physical dimensions of most standard power supplies:

ATX: 6x3.5x5.5", HxWxD. Most common. Uses 4 mounting screws.

Mini-ATX: 5x3.5x5", HxWxD. Rare size. Uses 4 mounting screws. Can be used in a regular ATX case, but often not the other way around.

MicroATX: 5x3x4", HxWxD. Use 3 mounting screws. Not interchangeable with ATX or miniATX.

Flex ATX: Even smaller than Micro ATX. Various sizes according to case specs; often not interchangeable.

Use the data above to determine if a particular power supply would fit your case.

The quality of a power supply can be estimated by its weight. While this is not a true scientific or thorough measurement of the power supply reliability, it is nevertheless a very simple and easy way for ordinary PC users to estimate and compare the quality of a power supply. Why weight matters

2. Power supply calculator

3. Correct connections Some boards have 20 pin connectors others 24 pin There is often a 4 pin plug required to power Intel CPUs Molex D plugs for IDE HDD and CD/DVD drives SATA power connections for latest HDDs and DVD drives.

Guide to changing PSU

  Andanotherthing 16:46 15 Dec 2011

Thank you both - especially for all the detailed PSU advice! I just think it is odd that removing the external hard drive solved the problem-then immediately after installing Win 7 it stops booting again - very odd co-incidence!

  BRYNIT 17:06 15 Dec 2011

I had a MD8818 that refused to boot when I had a drive HD2GO drive in the top bay, for some reason the computer could not decide if it was SATA or USB so I disconnected the USB cable which solved the problem as it treated it like an internal drive.

Like others have stated it sound like the power supply is about to fail but like all intermittent faults they are difficult to diagnose and with a power supply you don't really now until if completely fails.

Another possibility is that you have a static build up. Disconnecting from the power and holing the power button in sometimes soles the problem.

  robin_x 17:12 15 Dec 2011

My PC DVD drive stopped recognising DVD discs immediately after W7 Upgrade install completed.

In spite of trying fixits and messing with filter suggestions I never did solve it.

I blame W7 for burning out my laser!

Laziness and a spare ext DVD drive precluded further investigation.

  Andanotherthing 17:16 05 Jan 2012

Hi guys -well the new power supply -£13 from Amazon and 150w bigger than the last one arrived today - fitted it and ...the comp is working! So many thanks to you all. W7 still does not 'see' my optical drives but other than that all good. If anyone knows how to make W7 'see' the optical drives - do tell! Thanks again!

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