1 |
Hello! |
2 |
|
3 |
On Fri, 17 Aug 2012 09:50:40 +0200 |
4 |
Alex Schuster <wonko@×××××××××.org> wrote: |
5 |
|
6 |
> Hi there! |
7 |
> |
8 |
> Two days ago, my PC suddenly died, after working fine for half a |
9 |
> year. I used myrtcwake as usual to suspend to RAM, and it woke up in |
10 |
> the morning. But after two minutes, the screen went blank and |
11 |
> nothing, even SysRq, gave a reaction. I tried booting a couple of |
12 |
> times again, and sometimes it did not even reach KDM. Now, I cannot |
13 |
> even run Grub (from my USB stick) any more, I only see a "GRUB" |
14 |
> string at the top right, then nothing happens. |
15 |
> |
16 |
> Booting with SystemRescueCD also freezes sometimes. If not, I can |
17 |
> make it freeze after seconds by running 'memtester'. |
18 |
> |
19 |
> Booting good old memtest86 ran for an hour and only found one error, |
20 |
> then I aborted, removed three of my four memory modules (4GB each), |
21 |
> and tried different ones in the first bank. Memtest86 again did not |
22 |
> find much errors, but froze once. Running memtester after booting |
23 |
> from SystemrescueCD again makes the thing freeze in seconds. It once |
24 |
> also froze while being in the BIOs setup. |
25 |
> |
26 |
If the system behaves in such an unpredictable way (freezing at a |
27 |
random point), I usually check the following things: |
28 |
- RAM; |
29 |
- bloated capacitors on the Motherboard; |
30 |
- bloated or dried capacitors in the power supply unit; |
31 |
|
32 |
If your PC is only half a year old, it is unlikely that the |
33 |
capacitors dried. But they could easily bloat, especially if they were |
34 |
of bad quality or situated near some hot surface like heat sinks. |
35 |
Testing the power supply needs not only visual analysis. It would be |
36 |
good to attach the oscilloscope to the output and see the voltage |
37 |
level. It should not have large peaks (voltage jumps). But this is |
38 |
usually true for the old units with dried capacitors, as I said. |
39 |
|
40 |
If I were you, I'd tried to temporarily replace the memory with a 100% |
41 |
working module, and if it does not help - replace the power supply |
42 |
unit (if you do not have the necessary equipment to test it thoroughly). |
43 |
|
44 |
And one more simple test: turn on the PC, enter the BIOS setup |
45 |
utility and keep it running in this state. If it runs ok for some time |
46 |
(like a couple of hours), I'd say the problem is in RAM. |
47 |
|
48 |
Regards, |
49 |
Vladimir |
50 |
|
51 |
|
52 |
----- |
53 |
<v_2e@×××.net> |