New Build Kernel-Power Event ID:41 Task Category (63)

OK just built an new PC everything is working great but I have 2 strange issues.
1) if I switch off power by the mains then switch it back on then turn on the PC it starts to boot for 2/3 seconds then turns off then restarts again and boots normally.

2) Randomly last night it randomly restarted twice out of nowhere all I was doing was downloading games on steam and browsing the web. I then checked the event viewer and I see Critical error Kernel Power event ID 41. now I'm using the pc now the exact same way as I was last night but no restart and I do not know what this error means or how to go about solving it.

Here is the event log

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331C3B3A-2005-44C2-AC5E-77220C37D6B4}" />

<EventID>41</EventID>

<Version>2</Version>

<Level>1</Level>

<Task>63</Task>

<Opcode>0</Opcode>

<Keywords>0x8000000000000002</Keywords>

<TimeCreated SystemTime="2013-08-18T03:07:06.816412800Z" />

<EventRecordID>7877</EventRecordID>

<Correlation />

<Execution ProcessID="4" ThreadID="8" />

<Channel>System</Channel>

<Computer>Aaron-PC</Computer>

<Security UserID="S-1-5-18" />

</System>


- <EventData>
<Data Name="BugcheckCode">0</Data>

<Data Name="BugcheckParameter1">0x0</Data>

<Data Name="BugcheckParameter2">0x0</Data>

<Data Name="BugcheckParameter3">0x0</Data>

<Data Name="BugcheckParameter4">0x0</Data>

<Data Name="SleepInProgress">false</Data>

<Data Name="PowerButtonTimestamp">0</Data>

</EventData>


</Event>


Thanks in advance