Is this a PSU problem

  macca40 23:11 14 Jun 2003

Today I installed a new hard drive for a mate,
was 10g 5400 revs- new one 40g revs 7200.
system-- Duron 750MHz, floppy,CDrom,AGP card sound card.HSF,case fan,and modem.
problem is the computer keeps swiching off or re-booting .Then noticed the PSU is only 235W.Could this be the problem.The PC was O/K before the upgrade.

Thanks macca

  woodchip 23:15 14 Jun 2003

Possible but cannot say for shure remove CDrom Power cable to confirm if it starts it will prob be PSU

  woodchip 23:16 14 Jun 2003

PS have you auto detected the Drive in CMOS setup

  macca40 23:30 14 Jun 2003

Yes its set in Bios auto detect. If i put new drive in my Pc with 300w PSU it works think it must be 235w PSU.

  keith-236785 00:20 15 Jun 2003

has the new drive been put in as well as the old one, if so then unplug the power to the old drive, see if that makes a difference.

I doubt it is a power problem though, might be a ata problem, motherboard not supporting the new drive ata speed.

Ie is it a ata133 drive, if so your motherboard would need to be pretty new and also you would need to use an 80 wire ide cable

could you give us some info about the motherboard / new drive spec

  macca40 07:07 15 Jun 2003

Just the one drive,also 80 wire cable.
the drive is 133ata. The motherboard is Ultra DMA 33/66 Bus Master IDE.Will 133ata not work at 33/66.

  -pops- 07:17 15 Jun 2003

235 Watt is very small for a modern machine.

I work on a rule of thumb that a modern machine with just the basics (1 x processor, 1 x HDD, 1 x CD unit, 1x floppy) needs a 300 Watt PSU. ANY additions such as a graphics card with fan, another CD unit (especially a writer), another HDD, non-self-powered USB equipment etc., allow another 25 Watts each.

So, a machine with 2 x CD/DVD units, 2 x HDD, 1 x cooled graphics card, 1 x USB item would have a 400 Watt PSU. (300 W basic + 4 x extra items @ 25 W each)

This is very empirical but it does allow a good reserve of power should it be necessary. Upgrading a PSU from 300 to 400 Watt doesn't cost a lot.


  macca40 09:36 15 Jun 2003

Just tried another PSU that works o/k,
but the HDD light is now staying on all the time.

Any ideas?

Thanks macca

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